Is it permissible to take out a loan from an usurious bank to purchase a home, in order to avert the harm resulting from the questioner's continued stay with his family, and due to the unavailability of other housing options?

What you have mentioned is not a necessity that permits engaging in usury (riba), which is forbidden by Islamic law and from which Allah removes all blessing. You must fear Allah and turn your attention away from this usurious transaction, as there are many permissible alternatives to usury for those who seek them, such as Islamic financing methods.

You must not leave your wife with your father as long as he harasses her. She must veil herself from him, and it is forbidden for her to be alone with him. Therefore, provide her with an independent dwelling, for an independent dwelling is primarily the right of the wife, and her presence with your father could lead to great evils.