What, pray tell, do you imagine they use to cut down trees for the beloved wooden toys you insist upon as the only suitable toys your children should be gifted with?
Yes, irony at its best!
I have a MIL who sends me all sorts of things in care packages about 3 times a year. Most of which I do not need. So I put it in the goodwill box, and a couple of times a year I donate it. Surely someone will use it. She likes to buy us things, it makes her happy, and I'm not going to rain on her parade. My husband's SIL is very resentful of her buying anything for them and has made it clear not to get her grandson any toys. MIL knows this - so she has to ask permission to get grandson a gift. SIL said, "Why doesn't she just give us cash". I think that is so rude and selfish. And MIL gives us cash all the time too. She's VERY generous.
Indulge the woman - even if you don't like her. She's your child's grandmother.
I send a thank you card for every thing I am given, whether I like it, use it, dress my kids in it, or not.