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Alan Thicke’s sons – Robin and Brennan – believe their dad’s third wife is making moves to get more of his estate than she deserves, and they’re taking action to nip it in the bud.

The sons, with attorney Alex Weingarten, have filed legal docs in Alan’s probate case, claiming his widow, Tanya Callau, is greedy and overreaching to get a bigger piece of the pie than their dad intended in his will. In the docs they say she threatened to go to tabloids if her demands are not met.

They don’t mention a specific dollar amount she’s allegedly trying to get.

Alan got rich and famous long before meeting Callau, and they signed a prenup when they wed in 2005. The sons say she’s threatening to challenge the prenup.

Source TMZ