I have a similar R with my MIL and she supports me and wants to have a relationship with the kids and realizes that while her daughter is in MLC the R with the kids will be through me.
The last time I was with her we talked a lot and I told her that her daughter had to do this on her own and in her time. I think she felt bad for me but went on to say that I had more patience than anyone she has ever known.
It is nice to have that support and know that if one day you were to reconcile with your W the R with your MIL will still be there and probably be an even stronger R.
Cheers
Formerly "missherlove"
Me49 XW49 M17 T19 S16 D20
Expose yourself to your deepest fear; after that, fear has no power, and the fear of freedom shrinks and vanishes. You are free.