I've not got any (young) children but, if you're looking for reference points, this might still help:
I'm unemployed most of the time, with occasional casual work (which, fortunately, is usually quite well-paid). To give you an idea of my life-style, I'll tell you that I normally try to spend around 50p or 60p on cooking a meal. (Spending a �1, like I did at lunchtime today, is a rare luxury). I might go out to the pub, for a couple of pints, tomorrow night but it will be the first time for several months because I can't normally afford it. (However, I do admit to having a bottle of cheap Italian wine waiting to be opened as soon as I've finished typing this!). My car cost me �350. My clothes come from Tesco, Asda or charity shops.
Got the picture? Yes, I'm definitely at the 'pauper' end of the scale. However, I'll probably spend around �30 on presents for my adult son and his wife, together with another �30 on their 3-year-old son. I'll spend around �20 on a present for an adult friend of mine (who has, since his childhood, always been treated like my nephew) and another �20 on various small presents for other adult friends. So that makes my total Christmas gift expenditure �100
Chris