Back story: I kicked (20yr) son out due to disrespect nastiness and volatile behaviour.

He was staying at a relatives flat but due to similar reasons had to leave there too he waited for them to come get the keys standing in the pitch black with every flat window open then spitefully said oh yeah I didn't leave keys where u asked and walked of laughing.
He has severe anxiety
Manic episodes
severe depression
narcissism
Is obsessive over money
Feels superior
Manipulative
Likes drama
Forgetful
Lacks concentration

Also diagnosed and sectioned aged 15 with ptsd due to childhood abuse (uncle)
His father had similar mental health but he had no malice and my son has vast amounts

Refuses to admit there's a problem or may admit to some things but refuses to get help for anything