This isn't really a AIBU, I don't think.
My children have now realised (age 8 and 4) that my M-i-L (Gran) gives better / more presents tha my mum (Granny). Everytime we see my MIL she has got presents for them , she spends more and gets more presents at both birthdays and christmas and always sends things at holiday time. My mum, however, just buys a present for birthdays and christmas and hardly ever in between and certainly not every time.
I don't want my children growing up thinking that Gran is a better grandma than Granny - but it's very hard to justify to them without slagging off either grandparent. Granny is very mean so she just gets you 2 presents a year or Gran is OTT and spoils you.
There is no way that I could say anything to my mum about it - do you think you could buy my children more presents????? Idon't think so.
But equally I can't really ask MIL to stop buying so many presents as it obvioulsy gives her pleasure.
I do hope that as my children will get older they won't just remember the number of presents, but certainly visits from Gran are always eagerly anticipated because she'll always have something for them.
It is quite a dilemma.