I do know my MIL has told H that she disapproves/disapproved of what he is doing b/c she told me she had told him so right a the beginning. She had asked to see him alone and he brought OW with him. This was the first time MIL had met her. However her actions show differently (just like many others already described). I'm pretty certain if I didn't have children I would not see my MIL despite her telling me right at the beginning that I would always be her DIL. I have made no secret of the way I feel and just like someone else wrote she told me it was none of my business who she chose to entertain in her own home.
She has always come here (rather than us go to her house) even when H and I were still together b/c her H (my Hs stepdad) is not a nice man and she can never speak freely whenever anyone goes round. So I still let her come (when it suits me) I used to put off things I was going to do in order to follow her wishes to come round but now if I have plans I tell her so and ask her to come another time. Most often she doesn't she just waits until it is convenient for her again.
Naej for the record I would treat my Ds the same as my S if they ever did what their dad has done to us.
Me 43 XH 45 M 2.7.88 Divorce 7.10.09 Kids D20,S17 & D15