I agree that there may be more symptoms than his diagnoses would allow for. He needs help. However, he is not open to it. That is a problem.
Since he won’t seek help, then your family should contact a mental health professional. They might recommend that your mother acquire a restraining order or that she temporarily remove herself and the rest of the family from the situation. Your father has gone to extreme measures to track your mother. That is worrisome behavior.
Encourage your father to seek help. However, he may not take your advice. If he is a danger to himself (i.e., threatens to end his life) or threatens to hurt anyone, call the authorities immediately. They will come to the home, evaluate the situation and take him to the hospital if necessary. Once at the hospital, he will be given treatment.
I’m sorry you’re faced with this dilemma. Do not hesitate to call the authorities. Acquiring outside help from mental health professionals will help you to navigate this difficult issue. Please stay safe and write again if you have additional questions.
Dr. Kristina Randle