I'm possibly a bit hormonal, but I'm in a real grump about this so I'm going to rant on a bit.
Well, I have several teenage nieces who (obviously) have birthdays, and also a couple of religious celebrations where we give gifts or money. I usually spend the same on everyone - £25, I personally chosse to double this for milestone birthdays, and if the girl in question is after something for £30 and I can afford to, I'm happy to pay a bit extra so she gets what she wants.
One of my sisters always keeps track of how much money the others were given/had spent on them, and acts as though we're diddling her daughters in some way if a smidgen more is spent on the others. It drives me bloody mad!!!
She will even have her eldest look online to see how much a particular gift has cost. She fails to take into consideration any change in circumstances between one nieces occasion and anothers and conveniently forgets additional treats her own daughters may have had for no reason.
I am now at the stage where I think sod it, enough with the niceties, the girls can have thoughtless money in a card and thats it! I enjoy treating the girls and trying to choose something they'd like and this tit for tat attitude really ruins it