What is the ruling on a son refusing to visit his father who orders him to shave his beard, and is he to fear his father's supplication against him?

Obeying and honoring one's parents are obligatory, unless they command an act of disobedience, such as shaving the beard. You must be gentle with your father, treat him with kindness, and not cut ties with him. If you fulfill his rightful dues according to Islamic law, we hope that his invocations will not harm you. Regarding your father's companions, explain to him with wisdom and politeness how Islam encourages righteous companionship and forbids associating with those who commit sins. You can also seek help from someone who has influence over him.