We only have 2 for the moment and spend £15-£20 I suppose. That's what they seem to feel is right (they give us a list of things if we ask) and also what I'm happy with.
As a slight aside, I have no qualms about spending different amounts on different sides of the family. H has 5 siblings - they spend about £20 on each other. I have one and my mum and we spend £50-£100 on each other, so that's what we spend. Also if we had one person who spent a lot less on us, I'd probably spend less on them - but try and get things that it wasn't clear how much they were - bargain bucket dvds etc.
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