As an only son, what are my responsibilities towards my parents? Are a son's responsibilities any different to those of a daughter? What are my responsibilities towards my parents in relation to those towards my wife and children?
Your responsibility is to look after your parents and serve them as a humble servant and try your best to please them and obey their orders in lawful matters. Your responsibility as their only son is more than the responsibility of your sister. Doing your best and serving your parents does not mean that you ignore the rights of your wife. Her rights on you remain preserved, although there should not be any contradiction between complete service to your parents and fulfilling the rights of your wife, but never do anything which can harm the feelings of your parents. They are your gate to paradise and eternal success
. Wassalam