Just some general mussing as me and OH have a difference of background on this one.
When OH was younger for Xmas his Mom and Dad would save all they could, then ask for a list from all 3 kids and then buy each child a few things they wanted regardless of value - so if they have £300 for example it didn't mean they would get £100 each it could be split £50, £130 and £120 and so on. And on birthdays they would have what their parents could afford at the time rather than a set amount so I imagine OHs youngest sister who is born in June got more than the one born in December.
Whereas my parents gave me and my brother a set amount per birthday and Xmas so we always got the same.
How important is this to you - do you make sure to treat your kids / nieces / nephews etc the same?
I currently have 2 neices and a nephew (2 from OH and one from my brother) and always make sure I spend exactly the same on them for Xmas / birthdays / Easter etc. If I want to treat one, I won't without treating the other (even though they wouldn't know each other to compare notes).