A Series of Unfortunate Events is popular with my young'un.
Also the Dragonrider series by Anne Macaffrey (sp?),;
Thomas Covenant, Unbeliever consumed me as I consumed this series.
Ringworld series by Larry Niven. Fantastic Science Fiction.
Rendezvous with Rama by Arthur C Clarke. Awesome. Also sci-fi-y, but fantastic as well.
Question: You mentioned younger sibs... I'm curious about the relationship I guess. I have a younger sister, much younger, and for every birthday, I bought her books. Until she was about 18 or so, she could count on getting a heavy rectangular present from me. When she was older, she confessed that although she loved (and loves) me very much, it would have been nice to get a Barbie or something.

My bad.