Long story short dh was severely abused by his mother and step father from a very early age.
When I first met mil and step father I thought they seemed ok, I would never have expected them to do that.
I eventually gave birth to my two sons and they have seen her quite a few times over the years but only with me present. Only a few years on when mil suggested having them alone did my dh tell me about the abuse.
I'm absolutely horrified and never want that woman anywhere near my children again 
Sil, aunts and uncles have being calling us up telling us it's all in the past and we can't deny mil access to her grandchildren.
I suppose some people would say iabu as I could be present when she sees the children but to be totally honest I can't bare the thought of even being in the same room as her after hearing what she did.
So what do you think? Aibu?