Is it obligatory to pay the expiatory feeding of sixty poor people for the sin of my deceased father, who said to his wife, "You are to me as the back of my mother"?

"Zihar" (declarative divorce) is one of the major sins, and it necessitates a severe expiation. If a Muslim dies owing a compensatory fast, it is permissible for his guardian to fast on his behalf; this is recommendable, not obligatory. If the guardian does not fast, sixty poor people should be fed from the deceased's estate, or another person may donate the food.