It is controlling - you can't tell people how to spend their money. You can ask them not to buy pound shop tat which breaks/is dangerous. You can say that storage is a problem but if they want to buy stuff, let them. The feelings of other people aren't their responsibility
Bugger that. I couldn't disagree more.
I'm similar to a pp who says growing up her parents would fill the living room with tat to make it look like loads of presents at Xmas - mine were the same. It's always been about quantity, not quality.
Now I have two dc they try to do it to them. I put up with it for a couple of years but Xmas 2012 was just awful. I don't care if it's ungrateful, it really was. We visited my parents Xmas morning - the dc were 4 and 2. There were piles of stuff for the dc, so much that my mum hadn't even wrapped it all, just shoved it in Xmas sacks. Honestly op, I would have welcomed 'only' 14 presents. We had 4 black bag fulls leaving - it took us 20 minutes each end just to load/unload the car.
It completely ruined the morning for me...the kids got bored with opening so much, were getting testy and grumpy (as were me and dh). We dumped it all in the living room then had to lug it all upstairs so we actually had room downstairs to enjoy the day.
I put my foot down last year and said (in advance) that on leaving we'd be taking one black bag of toys and anything that didn't fit would have to live at my parents. We had a row about it last summer (I gave plenty of advance notice) and I got called controlling, mean etc - but I really couldn't care less.