What is the solution to the father's continuous refusal of his excellent daughter going to her aunt's house, while he buys an expensive device for her less excellent male cousin?

A Muslim must obey his parents and treat them well, in compliance with Allah's command. He must obey his father if he refuses his departure, as his father only desires his well-being or to ward off harm from him. What is hidden from the son may not be hidden from the father, and the اصل is that a father desires nothing but good for his son.