Needs some book suggestions

I’m on the hunt for some books suggestions/literature/fiction for my kids to read independently and narrate. My daughter is 12. She enjoys historical fiction. Her latest reads have been the Anne of Green Gables series and Caddie Woodlawn. I want her to branch out a little and read some other types of books as well.

My son is 9, but he reads nearly as well as his sister. He started reading Where the Red Fern Grows, but it is so detailed, and he is basically just getting the big picture, which I guess is okay, but I’m wondering if it is too detailed for him. He is pretty sensitive, too, and I’m starting to wonder if the end is going to be too much for him. He finished Mrs. Frisby and the Rats of NIMH most recently. He enjoys adventure type stories.

I appreciate any suggestions you may have. My kids love to read, so I’m sure they would be willing to try something new as well. My daughter just tends to lean toward books about girls, but I am trying to encourage her to read a variety of stories.