My MIL spends about £250+ on each of my kids at Xmas. They are 4 & 18 months.
It doesn't actually bother me any more as it's nice for the girls to have lots of things but it is a bit excessive and also we definitely can't afford to spend that much. We spend maybe £50 on the youngest about about £100 on the eldest.
On Xmas day they wake up to about 3 sacks of presents off MIL and one from us. It feels little bit like she is trying to out-do us but I know it comes from a good place and that she's just excited.
How would you feel about being "out done" by someone else at Xmas?