No , your wife's role is to act in the best interests of the beneficiary , her nephew and wind up the estate in accordance with that principle.
Provided she does so. no harm can befall her. The father has no power in this situation and whilst he may be genuine there is a danger he is trying to get control of the nephew's entitlement. As such your wife actually has a duty to tell him to stop trying to interfere and safeguard the nephew's inheritance.
You are welcome.