Im looking for a book I read about 4 years ago. I don't remember much about it. All I remember is that there was a girl, I think hiding in an attic during the holocaust but I'm not positive, that had I think two or three kids. Im not sure with who but the first kid she had when she was 12 or 13. I know this is probably not enough to go on and it's a long shot that anyone will know what I'm talking about but any help or ideas would be severely appreciated.

Do you mean the Diary of Anne Frank?

Could it be Flowers in the Attic by V. C. Andrews? You said you weren't sure if it was during the holocaust or not so... maybe this is the book