Kane Chronicles by Rick Riordan
Twice a year Sadie Kane is allowed to see her father and her big brother. But instead of a nice, cozy Christmas, Sadie and her brother Carter are dragged into the British Museum – where their father blows up a relict, frees five Egyptian gods and gets trapped in a crystal sarcophagus. Sadie and her brother are catapulted in a world they didn’t know existed, full of magic and monsters… and have to deal with others like their dad who want to hurt them – because the Kane siblings are descendants from two ancient lines of pharaohs and, therefore, have been possessed by two of the five gods.
Talk about shitty Christmas presents
Sadie and Carter have to run for their lives, and save their father and the world from the god of evil, while they’re at it.