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Hello and thank you for using JustAnswer. It is impossible to diagnosis your son's father from a secondary source and without an actual face to face assessment. Given this fact, it is possible that he may have a delusional disorder where he actually has a fixed false belief that your family is out to persecute him and no matter what you say or do he will always believe this. The other possibility could be that he knows what he is saying is false and is trying to manipulate you and frustrate you on purpose; this would lead me to believe he may have a personality disorder like Narcissistic Personality Disorder (NPD). Again without a face to face evaluation I can only provide speculation as he would need to be assessed by a psychologist in person to confirm any diagnosis.