Grant Tinker’s widow Monday sued one of her stepsons for nearly $4 million she says she is owed from the sale of the couple’s Bel-Air mansion.

Brooke Knapp’s Los Angeles Superior Court lawsuit alleges Mark Tinker’s failure to honor the creditor’s claim she filed in November against the late network executive’s estate is a breach of the prenuptial agreement she had with his father. Mark Tinker is the special administrator of his father’s estate and has the authority to act on creditor’s claims.

Knapp seeks $3.9 million in damages.

Knapp and Mark Tinker had once filed competing petitions for the position of special administrator, but agreed in November that he would serve in that role, his attorney, Alan Brubaker, said previously. Brubaker could not be reached for comment on the lawsuit.

Knapp is in a legal battle with three other adult children of the former NBC chairman and CEO. Born from a previous marriage, they allege Knapp tried to impair their future interests in proceeds from the sale of Tinker’s multi-million-dollar Bel-Air mansion. John and Michael Tinker and their sister, Jodie Dilella, allege their father was subjected to undue influence and elder abuse by Knapp.

Tinker, who was previously married to actress Mary Tyler Moore, died in Los Angeles in November 2016 at age 90. He did not have any children with Moore or Knapp, whom he married in 2004.

“The charge of undue influence … is completely unfounded, without a shred of credible support and is nothing but a hammer intended to beat (Knapp) into submission and to gain for the Tinker children something which their father did not intend them to have,” according to Knapp’s court papers.

In April 2015, Tinker established a residence trust that not only complied with his premarital agreement with Knapp, but also protected his interests and those of his children by placing his half of his community property interest in the Perugia Way mansion in the new trust, according to the three children’s court papers. They say Tinker’s lawyer had long wanted to make sure the executive’s children received the mansion or its sale proceeds after Knapp died.

The three children further maintain that Tinker’s mental state was in decline — his death certificate listed dementia as one of the causes of his death — when he called his attorney two months later and said he wanted to revoke his residence trust and restore his home back to himself and his wife as community property.

Knapp sold the Bel-Air mansion in February for $10.2 million and bought a home in Mandeville Canyon, the children’s petition states. She also created a new trust with herself as trustee, according to their petition, which alleges their father did not revoke the residence trust under his own free will and that a judge should therefore invalidate the action.

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