What can you do to actively address your fears? It isn't engaging with the stbx.... can you get your ducks in a row to help? If she is lining up the MIL as a "character witness," can you get one in your favor?
I think it's standard to have these witnesses. My L asked me to give her 2, and I gave her my pastor's wife who's also a friend and our TKD instructor who also attends my church. To me it's telling that her character witness has to be a relative. I think it's prob. better to have non-relatives really, less of that family bias and all that I would think.
My H had threatened in the early court docs and you know just telling me that I might lose the kids, but seriously I've been told by everyone that unless you're basically a criminal or something that doesn't happen. I think you should let the fear go. It's going to work out like it should. BTW, I think my H has way backed off that stuff too, I think some of it is just bluffing and threats to scare us into submission or they're hoping that anyway. Karen