When we first heard Katherine Chancellor refer to her son Brock Reynolds, he was cavorting on his inheritance in Europe with Lorie Brooks, daughter of newspaper editor Stuart Brooks, while attending college. Brock was estranged from his mother, and it was implied that after his father's untimely death and her remarriage, he had gone rather wild with sex and drugs.

Brock would drop in and out of Katherine's life over the years. He'd show up at her door, strum his guitar and sing for her, get involved in his mother's life, often rescue her from a situation, then disappear as suddenly as he appeared.

In 1974, Brock returned home a changed man who had found God and a new life with the World Hunger Organization, ministering to the disadvantaged people of India. He found his mother had become an alcoholic and heavy smoker, and was on the brink of losing her husband, Phillip Chancellor II, to her paid companion Jill Foster. But even Brock could not convince "The Duchess", as he called her, to join AA. Instead, Kay arranged for Brock, who was attracted to Jill, to propose. Jill accepted, and Brock married them himself. Before it was consummated, Jill found out she was pregnant by Phillip. Jill broke the news to Brock who agreed to back out of their marriage, which was not legal anyway. But Phillip died before the baby was born, and it was Brock who tried in vain to talk Katherine out of buying Jill's baby. When that didn't work, Kay went to court to cut off the child's inheritance from Phillip. Brock ended up testifying on Jill's behalf, but Kay won. Brock always seemed to end up in the middle of the continual battles between Jill and Kay. Over the years, Brock was a friend and confidant to many, including concert pianist Leslie Brooks in her battle with lack of confidence, and Allegro waitress, Joann Curtis in her efforts to lose weight and regain her husband.

In 1977, Brock returned home in time to use his law degree (which he had somehow managed to get in Paris those many years ago) to represent Snapper Foster, who was charged with "pulling the plug" on his father Bill, who was dying a slow death from emphysema. He also represented Snapper and Chris in their bid for custody of the child Karen Becker.

Many years later Katherine's then-husband Rex's former cellmate, Clint Radison, found a woman named Marge who worked at a diner, who was a dead ringer for Kay. Clint and his cohorts trained Marge to pass for Kay, then held captive Kay and her "ditsy" maid Esther. Meanwhile Marge drove Rex away, and he filed for divorce. Clint was then free to liquidate Kay's assets. But Brock made a surprise return from his missions in India. Brock, with the help of Mitchell Sherman, discovered the ruse, and rescued Kay and Esther. Brock was there for Gina Roma, Clint's duped wife of, and they became close.

More recently, the constant battle of living with Jill drove Katherine close to the bottle again. Rather than succumb, she ran off into the night, contemplated suicide on a bridge, and ended up lost in the streets, her purse stolen, cold and alone. She was rescued by a homeless girl known only as Mac, and brought to the Genoa City Shelter. The elegant rich Katherine Chancellor managed to blend in with the group, befriending Mac and alcoholic Birdie. Mac finally trusted Kay enough to confide in her the letter she carried next to heart-a letter from the father she had never met, written to her mother. Amazingly, the father turned out to be Kay's son, Brock, and Kay realized that Mac was her granddaughter. (It was only then that we heard the story of Mac's mother Amanda and Brock being in love and working together in India some 15 years earlier. They split up when Amanda wanted to return to the states, but Brock felt his calling was helping the needy in India. Amanda did not find out she was pregnant with Mackenzie until long after she returned to the states. Rather than burden Brock with a choice between them and his calling, Amanda chose not to tell him.) The trio of Mac, Kay and Birdie became close, each helping the other, and Kay eventually decided she was ready to return home to the estate with her friends and face Jill.

Kay decided to track down her son to meet the daughter he never knew he had, but returned from her search for Brock in India without him. Shortly afterward, Kay received a call that Brock was presumed dead. So of course, Brock showed up at the door out of the blue, and they were reunited after many years. Mackenzie returned to the estate to get her things, intending to leave town, just as her father walked in and they were finally united. Mac and Brock lived on at the Chancellor Estate, slowly learning to trust and love each other. Something in his past appeared to be haunting Brock, though he wanted to be a father to Mac. Brock went to Louisiana as a volunteer helping to build houses for the poor.

Afraid that Mac's mother Amanda would show up in Genoa City and take her back, Katherine petitioned and was awarded legal custody of Mac. That eased Mac's fears of discovery, and she agreed to join the on-screen Glo by Jabot Kids. When Amanda did show up, Mac rebuffed her and sent her away. But Amanda said she had divorced and run away from her husband Ralph too, and was living at the same homeless shelter where Mac and her father were volunteers. With her boyfriend Billy's help, Mac and her mother accepted each other in their lives again. Enter abusive husband Ralph, who tracked Amanda to Genoa City, and began stalking Mac. He coerced Amanda into stealing from the Chancellor's for him after she accepted Kay's offer to move in. Amanda let him into the mansion while all were at the prom, but Mac returned home unexpectedly and much to her horror, was met by Ralph. Billy arrived on the scene as Ralph was about to molest Mac again, confronted him, and whacked Ralph over the head with a fireplace poker.

Thinking he had killed Ralph, Billy took Mac to hide out in their special place, the old Abbott playhouse. Thinking they were doomed, Billy and Mac realized they still loved each other. Ralph kidnapped Kay after she returned from chaperoning at the prom, and tied her up in a motel room. Ralph, disguised as a cop, talked Raul into telling him places where he might find Mac and Billy. Meanwhile, Larry Warton found and rescued Kay. Ralph showed up at the playhouse, too late, but found the kids at a campsite where Raul and Billy used to play as kids. Ralph knocked out Billy by whacking him over the head with a rock and grabbed Mac, but our hero Larry showed up in time to rescue her. Larry and Ralph fought, and just before the police arrived, both ended up going over a cliff to the lakeshore below. The next morning Ralph came to and tried to kill an unconscious Larry with a rock. Scared away by the arrival of the police, Ralph disappeared into the bushes. Larry recovered with minor injuries and major thanks from Billy's mother Jill for saving her son's life. Because Jill had video evidence that Amanda had stolen her jewels, and after nearly getting both her own daughter and Jill's son killed, Amanda agreed to leave town if Jill would drop the charges.

Billy left for Louisiana that summer to help Brock build houses for the poor. Mac left Genoa City that fall to attend Northwestern University. Both Billy and Mac returned to Genoa City for Christmas, and decided to attend GCU and share a loft apartment with Raul and Brittany. By spring Billy had proposed and Mac and Billy were to be married with Raul Guittierez as best man and Colleen Carlton as maid of honor. But with the reveal that Billy's mother Jill's actual birth mother was Katherine Chancellor, their lives were shattered when they realized they were cousins. Imagine Brock's surprise that the young girl he once married in Jill, but fortunately never consummated, was actually his half-sister! Brock returned to New Orleans, and Mac and Billy both left town on their own, devastated by the news.

Brock returned to Genoa City to partake in Kathryn's alcoholism intervention, and is currently helping with the rebuilding of New Orleans in the Hurricane Katrina aftermath.

In November 2008, Brock returned to Genoa City from his home in New Orleans to attend the funeral of his mother Katherine (who was not really dead, it was her doppelganger, Marge). Brock officiated at the service, and several people from Kay's past attended; her late grandson Phillip's wife Nina, her step-son and daughter Danny and Gina, her attorney Mitchell, and her old friends Liz Foster, Traci and Ashley, and Dina Mergeron. Daniel sketched a picture of Kay which was framed on her casket. In conversation after the funeral, Brock was asked why he always called her "Duchess". Brock replied that she was always a duchess to him, and Liz added that she had a regal manner about her. Meanwhile Marge's friend Murphy found Kay lying beside a creek, assumed it was Marge, and after she refused to go to a hospital, took her home with him to his trailer house. Kay's injuries were slight, but she is confused now about who she is, trying to fit into what Murphy tells her of Marge the waitress with the drinking problem.

Kay's will was read, and Brock received one percent of her billion-dollar-plus worth in trust to continue his good works and was named Chairman of the Chancellor Foundation. Her step-children Gina and Danny received a one-half of one percent in cash. Esther received one tenth of one percent and Kay’s half of the estate, so that Esther could live her life in financial freedom. Nikki received all of Katherine's jewelry, including a family heirloom emerald and diamond ring given to Kay by her mother. Grandchildren Cane, Billy, McKenzie, and Phillip received one-quarter of one percent in trust. Katherine left one fifth of one percent to Amber, so that she and Daniel could pursue their artistic goals, and gave Amber the sole rights to her memoirs, which Jill had forbidden her to publish. Jill was left the remainder of the assets, all but five percent of Kay's Jabot stock. That five percent, in addition to a Ming vase, was left to Gloria as both were given to her by John Abbott. Jill was livid, knowing that the Chancellors now were no longer majority stockholders.

But all of that was undone when months later a blood test proved that Brock was the son of the woman who claimed she was Kay and that Marge was buried in her place, which ultimately meant that Jill was not Katherine's daughter after all. Assured that all was well, leaving his mother in her new fiancé Murphy's care, Brock returned to New Orleans.

In May 2009, eighty year old Katherine married Patrick “Murph” Murphy in the Chancellor garden in a service officiated by her son Brock.

In September 2010, Brock returned to Genoa City to officiate at Phillip “Chance” Chancellor IV’s funeral. Chance actually was not dead. His death was staged to enter him into the witness protection program.

On November 5, 2010, Brock returned to Genoa City to officiate at the impromptu wedding of his daughter Mackenzie to J.T. Helstrom.

On October 7, 2011, Brock returned to Genoa City to be with his mother who had suffered a stroke.

On September 3, 2013, Brock was a guest at the celebration of life for his mother Katherine following her death. His comments during the ceremony recalled many years ago, how shocked she had been when her profligate son had returned full of God. Days later when Katherine's will was read, Mackenzie, Phillip, Chance, Brock and Nina were bequeathed one quarter of her estate to be shared equally.