My MIL really, really loves Christmas and always goes way over the top buying things for our DC. Last year she bought far too much and the kids (aged 2 and 4) were completely overwhelmed. We ended up opening presents over 2 days as they found it too much. DH spoke to her this year a few months before Xmas and she promised that she wouldn't buy much this year. Despite this she bought as much as we did for our children and it's far too much (her stuff alone would have filled the space under the tree). She also insists on everything from her being from Father Christmas. I know there are different opinions on which presents are from Father Christmas but I find it really intrusive that she wants to pass off her presents as having come from him. It also makes it odd if we don't see her on Xmas day as she has to pretend that he dropped some presents at hers by mistake and I worry that our eldest will see through it and start to doubt whether Father Christmas is real as she won't believe Grandma's stories. I want to get DH to speak to her before next Christmas and set an absolute maximum number of presents that she can buy for each child and that they have to be from her and not Santa. Is that reasonable or AIBU and a massive killjoy? She will hate it but I just feel she is overstepping here.