How to help my 31 year old son with oedipus complex he dislikes his father has now accused him of sexual abuse?

my son never had girlfriends at 24 his first was my age,since late teens has had like/hate relationship with father I seemed to be his only friend bullied younger siblings.Now tries to emotionally hurt me all the rare occasions we see him,does not like family occasions or meeting people of going out,has lovely girlfriend now. Has seen two therepists the first said he had oedipus complex,has undergone hypnotherepy with second and has now accused his father of sexually abusing him as a child when he was 2 or 3 I can assure you this is blatently untrue also says it could have happened to younger siblings and they have blanked it out.Will not give details we told him it was untrue that his father has always loved him and would never hurt him,but he gets angry and attacks us saying we never listen or that we force him to come to family gatherings knowing he hates them.He never contacts his siblings but we get on very well with them spending most weekends helping them with home improvements.When he and his girlfriend are with us he is showily affectionate to her holding hands,arm around shoulder never letting her out of his sight,tells he what she can and cannot drink.She loves him very much.He has difficulty with sex.He was a very loving active though shy little boy,his anger started in his late teens he became violent with his siblings and on a few occasions had to be physically restrained from going after his sister.Please help we love him very much but just want him to be better,we also want the person back that he used to be,he was a lovely loving boy we don't know where he went.