What do you do?

I am trying to bring our girls up to be well rounded. I like to give them open ended toys to play with ie: wooden blocks, duplo, fuzzy felt, crayons & blank paper (they don't need colouring in books)......I don't believe they need toys like 'Barbie' & princess dolls at such young ages. BUT when they are given toys that I think are inappropriate by their grandparents ie: girly magazines that had a princess crown & wand attached, princess colouring in books.....what do I do?? Make them mysteriously disappear? Let them look at pictures of 'Hannah Montana' & 'Pink?' My eldest is 3yrs old....She doesn't need this sort of stuff to play with her mind, or to 'grow up'. I want her to be a child - to be free to be who she is.