Is it permissible for me to help my father with his homework, and his oral and written exams, which do not involve supervision, knowing that he is not compelled to do so and believes there is no financial gain or harm to others in it, while I consider this to be cheating?

"Writing assignments and academic homework for others to submit as their own work is a type of forbidden deception (ghish). Therefore, it is not permissible for you to write assignments for your father for him to present as his own work, and there is no obedience to your father or mother in this matter. Rather, you must treat them with kindness and help them so that they can write their assignments themselves. If they ask you to write, excuse yourself gently and politely, and explain to them the religious ruling regarding the prohibition of deception."