Sorry long but it doesn't make sense otherwise and I don't want to drip feed.
MIL has spent the last 7 years bullying and belittling me at every opportunity and can be really spiteful.
MIL decided she would take DD to visit a different Father Christmas this year, one of the expensive ones that has a petting farm with reindeer, DD loved the reindeer and said he wasn't a bad Father Christmas as it goes but his grotto wasn't as good as the 'real one' I usually take DD to at the church fair, where FC knows DD's name and asks how her dog is etc (and is my Dad). MIL 'oh for goodness sake you're 6 any normal child your age knows the truth by now, that grubby church hall your mum takes you to isn't real either, there's no such thing as Father Christmas and Christmas is just a made up load of commercial rubbish celebrating the birth of an imaginary baby.' 
DD is really upset and doesn't even want her advent calendar because she says there's nothing to look forward to now, I know DD was likely to find out the truth about Father Christmas soon and fully expected this to be the last year she really believed in him but I'm furious that MIL would be so spiteful as to tell her like that or imply there was something wrong with her for not knowing and can't even describe how angry I am about the rest of it, I'm Catholic.
MIL then came round yesterday with a huge shopping bag of sweets for DD and none for DS as hes not DH's biological son I told DD to pick 1 for her and 1 for DS and I'd put the rest away for later, MIL starts on about me being mean and ridiculous, part of childhood is eating sweets til you feel sick I mentioned to MIL how upset DD is and MIL started screaming in my face and calling me stupid, DS tried to stick up for me but DH didn't say a word, then this morning MILs just text saying shes picking DD up from school at 3.15, I've said not today, she sent back 'it wasn't a question'. as it happens DD has a school play this afternoon so I will already be at the school (MIL was invited before the argument but school plays are boring) So DH and I have started the day on an argument because I asked him to have a word with his mum and he told me to stop winding her up.
AIBU to think its not I'm winding her up, she's just a cunt and that if DH loved me or had any respect for me he'd step in occasionally, I don't want him to go NC or anything but the odd 'Mum, that's enough' would be nice, I wouldn't let my parents treat him like this and its making me question if i want to be with him anymore.