Gifts

How do I tell family to stop buying my children books without sounding ungrateful 😅 Due to the amount of books that have been brought I have far too many, every time my mother in law comes over she brings a book and every time I see my nan she gives books too. I politely say thank you, we will read that one tonight and comment on how many books we already have but they keep buying them. I currently have 3 holes of the ikea storage unit full of books and a bookshelf in each of my daughter’s bedrooms full of books. I feel guilty giving them to a charity shop when they are spending money on them but I’m just running out of space. Any tips on how to tell them to stop buying without sounding really ungrateful.