My mum (early 70s) is planning to leave my step father at some point this year. I'm the only person in the family who knows about this, she's sworn me to secrecy. The only other 2 people who know are her closest friends. We all support her decision because her husband has been getting her down mentally for years now. No physical violence or anything, but he's very depressing and it's taking its toll on my mum. Counselling etc isn't an option because she's absolutely certain that she wants to leave and make fresh start.
I've offered to help her financially and with a temporary place to stay but don't want her leaving at my house long term.
There's a liklihood she might eventually move in with one of her friends who has been very supportive and has even sent me photos of the accommodation he can offer her at his place. I said fine if she'll be happy there and living with him, I'll support it.
Thing is, despite my step father's negative traits, my child (8) and I have a good relationship with him. Child actually dotes on him and they are very close.
When mum eventually leaves and it comes to light that I helped her/knew that was her plan, it will create awkwardness between stepfather and I. If he reacts in any kind of aggressive, nasty way then that will also potentially jeopardise his relationship with my child because I won't allow my child to exposed to any toxity.
What can I do?