Hinduism believes that it is desirable that the son performs the last rites of a deceased

It is believed that one who is blessed with a son need never worry about thier last rites

Vashistha Smriti says, one who has a son is entitled to enter all regions of universe & one who is having grandson is entitled to eternity

Manusmriti, strongly says that one who has a son will be protected from going to hell

All the above