ANSWER:

If everyone is living under one roof and eating from the same kitchen then only one sacrifice is sufficient for the whole family, regardless of the earning members.

We are living in joint family system. Me, my wife, 1 son, 2 brothers who are earning among them one is married so his wife is also with us, 1 sister unmarried and our parents. Shall each of us earning and having wife have its own animal to sacrifice on Eid or one from our father will be sufficient for everyone?

Slaughtering |