I know, it's bloody August and I shouldn't be thinking about Christmas, but I'm aware that people start booking Christmas meals in restaurants ridiculously early!
Bit of background, MIL and FIL are lovely and we all get on very well. They are extremely selfless and do a lot for the whole family. MIL's Mum has early dementia and after her Dad passed away this has become increasingly worse, to the point that she's in a care home now. I must add that it's a very nice care home indeed and she is extremely well looked after.
GMIL gets very confused and frustrated very quickly, especially at family events. She finds it very distressing and keeps asking where her husband is. MIL is finding it extremely tough visiting her several times a week and even more so now that GMIL often doesn't recognise her. 
So... MIL is really big on Christmas, she loves it. They usually book up at a fancy restaurant and take GMIL with them. However we were thinking of inviting MIL and FIL here for Christmas with the dc which they would absolutely love but not including GMIL.
I feel awful even thinking of not including her but MIL won't be able to relax, she won't be able to have a drink because GMIL won't go in a car without MIL. She wouldn't have any of it if one of us picked her up and dropped her off so that MIL can relax.
GMIL will probably find it quite distressing especially with two small, excited dc. Sadly as a result of her illness her behaviour is extremely unpredictable.
We feel awful for even considering it without GMIL but we just don't know what to do.
I'm also worried the suggestion will upset MIL because it would put her in an awkward spot with GMIL.
WWYD in this situation? I'd be grateful for any advice.