I really hate my grandfather. What do they do? They are too selfish. I have given them lucky money, but usually they are from their hometown, and my mother still asked me to give them lucky money.

According to common sense, filial piety is the responsibility of children. Grandpa, that was a generation ago. Unless you were a child, he took special care of you, otherwise you have no special responsibility. If you are not satisfied, you can tell your mother not to kidnap you morally. Tell her that you are his daughter and you have to pay for it yourself.