What should the questioner do regarding his family, who commit various transgressions, such as not adhering to hijab and prayer, listening to music, having statues and immodest pictures in the house, and depositing money in a usurious bank, especially after his repeated attempts to advise them have been in vain?

All that you have mentioned about your family's situation increases the burden of responsibility upon you, and for it your reward will be multiplied if you guide them to enjoin good and forbid evil. Their statement, "Everyone does such and such," does not justify the sins they commit. Moreover, what you anticipate—that your father might think you are overly strict, or that he will tell you, "This is my concern, not yours"—does not justify abandoning your advice to him and forbidding him from the evil he is involved in. Therefore, you must strive to reform your family by enjoining and forbidding them, and by supplicating for them.