Longtall Wow. I think I would be just a little bit annoyed! 
I have a bag of educational and information books from DP's mum (it's because of her career why I think she has so many books!). Not to sound ungrateful at all, she means well, but they really are too old for my son! But I'm putting them in the attic as books are always worth keeping and for when my son gets to school next year.
I get given kids clothes from my sister sometimes and some are too big for my son (he's 3) somehow I end up with clothes aged 5 years! I did used to bag them up, put them in the wardrobe and wait for my son to grow - I mean before he was born, I got bags of boys clothes aged 3 years! Yep. But now I've decided, although it's resourceful, I can't keep clothes for years before they fit him, that's too much, ha!
I sorted out my son's clothes again today and got rid of some more, some bottoms that I'm sick of seeing that I find are the last resort if I can't find anymore for him. And a couple of tops that I'm sick of seeing!
I even went through mine and DP's socks and un-potatoed them all! They're not done the Kondo way but are folded in a much more "resting-thank-you-for-the-day" way. I wasn't going to even fold socks as I didn't think it would be easy to maintain at all... I'll see if DP comes along and screws it all up again in a hurry for work!
Sometimes I just feel like throwing everything out! I keep finding bits that I decide to get rid of as I really don't want them anymore and get added to the 'to go' pile of bags!