My sister is 21 years old and has been dating a guy with Paranoid Schizophrenia, she accepts this and we had only met him a handful of times before her 21st birthday and didnt think anything of it. On her birthday i had arranged and made it possible he played up saying things about our family and other thngs which at the time we just ignored the night was going really good until i had just about had enough of listening to him i told him that we didnt care that he was into drugs and other stuff we just wanted to show my sister we all love her this just made him worse and he carried on till 7 in the morning the birthday was over 2 weeks ago i had to kick him out of my house as he decided he was gonna continue when i brought home my 3 children he threatened our mother and my sister blames us for what happened i cannot accept someone like this into my house but however have tried to understand his condition my sister will not talk to me and when she does she always brings up the birthday and how he was feeling, they have not considered that he disrespected me in my home and that he threatened our mother how do i try to get my relationship back with m sister withou having to deal with her boyfriend.