HI C.

 

I would highly recommend that you know that bi-polar is very like Ns or Ps- especially in the manic phase.

 

Heredity?  At this child's age - let's stop fixing the blame and start fixing the problem. Yes, it's often hereditary, but for those who are dealing with the consequences either way, it's boundaries or these people will steamroller you out of their way causing horrible devastation financially and psychologically until you step up to protect yourself.

 

Firstly I would recommend that you read everything about this that you can and, if he isn't taking his meds, then it's time for him to leave.