I would definitely order online. Amazon does do secondhand books in good nick, so you don't have to spend too much if it doesn't work out. Maybe Roald Dahl? James and the Giant Peach or something like that? Quite a lot of silliness there. A children's poetry anthology?
On a different topic, I bought Mummy a DVD compliation of "slapstick" like Buster Keaton, to show on the home's telly as Mummy loves her jokes and enjoys "pratfall" comedy now, so that might also be an option.
I wouldn't worry too much about buying children's books - lots of people do these days, at all ages. I can see where you are coming form but I would be surprised if anyone had a problem.
On a different topic, I bought Mummy a DVD compliation of "slapstick" like Buster Keaton, to show on the home's telly as Mummy loves her jokes and enjoys "pratfall" comedy now, so that might also be an option.
I wouldn't worry too much about buying children's books - lots of people do these days, at all ages. I can see where you are coming form but I would be surprised if anyone had a problem.