Is not helping one's father sell beer that contains alcohol considered an act of disobedience (ʿuqūq), especially since the son does not take money for it, and the father asks him to stay in the shop so that he (the father) can go to Friday prayer, and he (the father) insults the deceased mother?

It is not permissible for you to help your father sell beer that contains alcohol, nor is it permissible to abandon the Friday prayer without a valid excuse. Allah has forbidden intoxicants and all that intoxicates. Obedience to the father is obligatory except in matters that contradict obedience to Allah, for the Prophet, peace and blessings be upon him, said: "Obedience is only in what is right," and "There is no obedience to a creature in disobedience to the Creator." You must advise your father to stop selling beer and to stop insulting your mother.