If your seventy-four year old father wishes to divorce your mother after all these years of separation, then he needs to consult with a family law attorney to file a petition for such and serve his wife, your mother.Given the harassment he receives, he should inquire about the family law attorney filing a petition for a restraining order against the wife as well. In this country, everyone has the right to be left alone from unwarranted and socially unacceptable conduct.