Meaning of invoking blessings for one’s parents after they die

Doing Tawaaf and completing the Qur’aan on behalf of the deceased

He loves his deceased father and wants to do something good for him

Honour your mother, but do not disobey your father!

Should they join their father in celebrating the Gregorian New Year so that they can get some money from him for their mother who is poor?

Should he leave university and get a job, and save up some money, so that he can do Hajj?

How can a son reconcile with his father when there is a dispute between them?

He was afraid that his sick father might die because he refused to eat, so he allowed the doctors to force-feed him; is he regarded as disobedient towards his father?

He stays up all night, and his parents are telling him not to do that; does he have to obey them?

Parents’ objection to their son following some Sunnahs