So many decisions

Recently I received a letter from my mother stating, “I get it,”  forgive me if I laugh at the idea that she gets it.  I want to address this for my children, her grandchildren, mainly to prove to them she doesn’t get it, and probably never will.   I want to tell her my conditions if she wants to be a part of my life, which has a lot of conditions.  Do I address this with my therapist present, or do I ask someone else.  I know she will never leave my stepfather, (molester), but I must at least attempt to give her this option for my kids and myself.  It’s quite a big question, but one I must pray and ponder on.