Robin Thicke and his brother have accused their father's widow of threatening them with bad publicity to score a bigger slice of the late actor's will.
The Blurred Lines star and his sibling Brennan have filed a petition in order to protect their dad Alan's his legacy, and "prevent his testamentary intentions from being undermined by avarice and overreaching of his third wife, Tanya Callau".
The Thicke boys claim their stepmother has started to ask questions about the family trust they are co-trustees of and the prenuptial agreement she signed before becoming the third Mrs. Alan Thicke.
"Now that Alan is dead, Tanya claims there are numerous problems with the Trust and the Prenuptial Agreement," the brothers' attorney Alex Weingarten writes in the petition. "Tanya asserts that there is no chance the 'Prenup' could withstand legal challenge and that she has very significant community rights in the Trust’s assets...
"Tanya also claims 'Marvin rights' asserting that she had to forego opportunities to pursue and advance her own career in order to support Alan and be his companion and partner, including raising (their son) Carter."
Weingarten also claims Tanya has "threatened to make her claims fodder for 'tabloid publicity' unless the Co-Trustees agreed to participate in a mediation and succumb to her demands."
"My clients made every effort to resolve this without the need for going to court," Weingarten tells The Hollywood Reporter. "The only thing they care about is protecting the legacy of their father and honoring his intentions. That is exactly what we are going to do."
Alan Thicke left each of his three children equal shares of a Carpinteria ranch in California, 75 per cent of his personal effects and 60 per cent of his remaining estate. He left Callau the ranch's furnishings, 25 per cent of his personal effects, a $500,000 (GBP387) life insurance policy, and insisted she could live at the ranch, as long as she maintained the property.