I find myself in a strange situation with my MIL & SFIL.

When I 1st discovered H's affair, it was the MIL I rang, sobbing, she was supportive from that day for approximatly 12 months, then things changed.
she did a 360, she removed her support the day H filed, after this contact ceased, MIL agreed with H that S15 & S18 could fend for themselves, that they should be supporting their father and her through this,not the other way round, somehow H had become a victim.

I had to break away, we had no contact with MIL from that day, although I did send cards & presents on appropriate days, in return I recieved cards, not the usual quality, no message of love, just a straight forward "from". I didn't give up on the relationship and 12 months on MIL has begun to contact again, small steps, brighter hello's, friendly chat, I am her link to her grandsons. I do not ask questions & she doesn't offer any information about H. I get the feeling that she is supporting him but at the same time feels for me and my situation.

for all the time I have known H, he didn't really have a strong bond with his mum, he would complain about her, he would need to be prompted to contact her. It is a different story now, H regularly contacts and visits her.

The relationship I had with MIL will never fully repair but I think it will just enough to get through future family events.