Law & Order: Criminal Intent S03 E09 Happy Family

The bludgeoning of a rich family patriarch has the detectives investigating several suspects, each with their own motives: his estranged wife whom he was about to divorce, a male friend of hers who was a parolee, their childrens' nanny, the victim's brother in law who is a doctor, even the oldest son. Goren and Carver call the family of suspects together to sort it all out... in family court.