Step son tried to take his life...

Things have not been good since my sister made up that lie and rumor about my step son molesting my 12 year old and 5 year old. It's been really bad... Before anyone goes "How do you know your sister lied?" She never actually told me. She told everyone else in town but never me. When I asked her about it she said she was just looking out for them. When I asked both my girls, my 5 year old just said he bops her on the head(their rough housing) and my 12 year old was disgusted I would even ask her something like that. When I told my sister both girls said it didn't happen she blocked me. This rumor kept going until CPS got involved and made us remove my step son from the house and he went with his grandma. They case was closed very quickly and they told me my girls showed NO signs of sexual abuse. After he came back he was already receiving death threats from his school. No one wanted to be around him. My daughter's were confused on why he all of a sudden acted like he didn't want to be around them anymore. I made a Facebook post publicly defending him. My 12 year old defended him at her school and said he never did anything like that. Its been terrible because everyone is thinking I'm defending a predator. Then I found out why my sister started that rumor. She assumed it because when we were over my house my daughter peed the bed. She was 4 and my sister had given her FOUR cups of hot chocolate. She was so worried yet never said a damn word to me just spread it around. So that was bullshit. Me and my sister never had a good relationship but this... This is what broke it completely.. My step son had a suicide attempt a couple weeks ago so he is in a mental institution to get help... She went to ruin our lives... Looks like she succeeded. People think I chose my step son over my daughter's. My step son no longer has any type of sibling relationship with my girls anymore and just acts cold towards them. My step son is now in a mental institution and she got what she wanted.