Etiquette, Morals and Heart-Softeners

It is an issue of dispute. If there is no other way, it is permissible.

This is correct!

It is permissible to take a bath naked provided no one sees you except your spouse.

Wa alaikum salaam Yes.

Using the left hand for drinking or eating is not permissible even for lefties.

Wa alaikum salaam, if your father has a valid reason, you must listen to him and not fast the voluntary fasting. But if he doesn’t have a valid reason and your fasting doesn’t affect obeying him and serving him, don’t break your fast.

Drowning an animal that is harmful is permissible, and Allah knows best.