LEELULUMPKIN "He would go NC totally out of loyalty to me but I have insisted that our DS should have a relationship with them regardless of what their opinion of me is." I cannot understand why grandparent relationships are so valued on here. Either someone is a good person to be in contact with or they are not. If they are not, then the fact you are related to them is of little consequence.
"I couldn't give a toss what their opinion of me is." That's fine if their opinion stays their opinion, but what if they influence your son negatively towards you?
Pallisers "The problem is (well it would be for me) how comfortable do you feel being married to someone who seems to be able to calmly turn off his emotions and knock 2 people out of his life without any reason." But he may well have a reason, just not feel able to articulate it.
"Even if he said, look I have my reasons but don't want to talk about it. otherwise I'd be thinking "well are you going to get tired of me or the kids some day the same way?""
That's quite a stretch, his parents have shown they are not very nice people, maybe he has got tired of playing happy families with them, maybe he knows more than he feels able to say. That doesn't mean for a moment he would feel that way about his wife or his children.
Ellaenchanted "However there were a lot of good times where we all got on, they helped us get on the property ladder, contributed to our wedding, helped completely re decorate our house which took months....as I said they're not all bad." They have helped you materially which is brilliant, but that is not the same as emotional support and it may be that your dh has decided that he doesn't want their practical help because maybe it comes with ties.
Sunshineandlaughter how can the OP have "... a regular weekly time to look after your kids and agree this with your oh - he can stay nc - you drop off and pick up. Invent a reason to need this babysitting if you must. Makes sure they still see them and leaves a small communication channel open." If her dh doesn't want the kids to see his parents? If he does, that is fine, but if he does not, that is a different matter.
HidingFromDD so sorry to hear of your experiences, you know, now, I hope, it is never your fault.