I just recieved this email back today, and oh GOD I really don’t think this is a good idea. DEF NOT! If she does this there will be no stopping his actions:

I’m going to ask your Dad to leave after Christmas.  When things settle down
sometime in January will you come home?  Again, I apologize for threatening,
not juvenile detention, police custody.  I’m hurt and upset as much as you
are.  Not only by you but also by your Dad and by my mom (not because she
took you in but because she threatened to tell someone who hurt me about the
girls).  I apologize but I think I need another chance to work this out.
Your sisters and little brother need you.  They are also effected by your
decision to leave.  They don’t see the situation as you do and they don’t
understand and have been hurt too.  You should email them and tell them you
love and that you’re still their big brother.  Let’s keep talking and
working things out between you and me.  Can we do that?  Get on with my
life?  You are my life.  You kids are the constant happiness in my life.  I
won’t forget you or give up on you.