Is there a nice way to deal with relatives who give age-inappropriate gifts?

Some of my family insists on buying my daughter gifts that are not appropriate for her age. She's going to be one, and my mother-in-law wants to buy a huge outdoor playset (like the ones you get at Costco). I've explained many times that those are for kids who are much older, but she insists that her babies played on them. I figure she can buy it but we won't put it up until she's old enough. I have other family members who buy Barbies and bead kits.

I've said many times that my daughter is too little for these things but they will not listen. They say "just watch her when she plays with them". I have given them more age appropriate toy suggestions but they refuse. They think buying toys like Barbies/beads is better because my daughter can play with them for years and years, whereas if they buy her baby toys, she might get another year out of them before she outgrows it.

I have explained many times the choking risks but I get dismissed. I have pointed out that the package says for children 3+, or even 5+. There's a reason why my child is never around them unattended.

It's gotten to the point that when we get these toys, I've started selling them (they never give me receipts) and using the money to buy my daughter something else age appropriate. This pisses people off, but I tell them that they need to buy age appropriate toys if they insist on buying her toys, otherwise this is what will happen.

Am I in the wrong for being like this? People are telling me I'm being stupid and if I just watched her while she plays this wouldn't be a problem, but I'd rather not take any risks. They put stuff in their mouths so quickly!

Edit to the above: The reason I sell them is because we currently don't have places to store these items. We live in a really small house so we have to be very careful about what we store. The playset they got my daughter is for kids 5+ and it's simply not safe for her at this stage. We can put a baby swing/toddler swing on it, but the steps to get to the treehouse part are too widely spaced for her and the slide and treehouse are just too big.

I even suggested a different playset but they wouldn't go for it.

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