GET A LAWYER. Just as Gordie said. Protect yourself. Consider telling the sisters husband what she is up to so he can protect himself. You call him a B!tch, but he does not know what is going on. You do, and you are still standing for it. Who is the B!tch?
And frankly, if she will not go, I would consider packing up the kids and leaving yourself. You are in danger.
Me42, H40 D12, S8, S7 A revealed: 7/13 Sep 4/14; Agreed to D 1/15