I'm looking for the name of a book about a girl and her family that live in a cave or the mountains.?

Question

The cave gets struck by lighting and splits the cave. Another family moves in next to them in the now split cave. The family are at odds with each other but the daughter of the original family, becomes friends with the son of the new family. That's about all I remember. The daughter in the story was a bit of a Tomboy and does NOT take place in modern times. It may be a kids book they would read in elementary or middle school. Thanks.

Answer 1

Could you be thinking of The Clan of the Cave Bear series by Jean Aul (sp?) or possibly The Island of the Blue Dolphins?