Is it permissible to ask a disbelieving father for money to use for da'wah purposes and personal needs?

It is permissible to ask a disbelieving father for money to spend on inviting others to goodness or to fulfill needs. You will find its reward with Allah, because the Prophet, may Allah’s prayers and peace be upon him, sought assistance from the weapons of Safwan ibn Umayya—who was a polytheist—during the Battle of Banu Mustaliq. It is recommended to utilize this opportunity to strengthen ties with him and invite him to Islam.