I can relate; we have a similar situation. We repeatedly tell her we have no space and don’t need the stuff. Often we won’t accept it and make her take it back. Sometimes we just take it and make space but it is really hard. You don’t want to be mean or come across as ungrateful but at the same time you do need to protect your own sanity 🙏 the thing is she will give you so much stuff that she won’t remember it all or know if you donate some of it 🤷🏻♀️ if it’s new/good quality you could also sell it but appreciate that just creates extra work for you.
I agree with the above, she’s clearly giving you excessive amounts and there’s no way she would be able to keep track! I would start organizing it all by size and start slowly donating all the bigger stuff to either a goodwill type of store or give them away on mommy groups to moms in need! 💜
Stop taking them. If she wants to hold onto them whatever but I'm not doing that over here. Tell her you don't have the space to keep clothes he won't fit into for a few years. Let her know that you can't hold onto it and that you'll have to donate them in the future.
She’s probably got no idea what she’s given you. Pick out the bits you like and donate the rest. Be sure to take a photo of him wearing things she’s bought for him.
Tell her you don’t have the space to store them so please stop buying them. If she doesn’t listen donate them all