Percy Jacksons Little Sister

PERCY JACKSON and LILLIAN JACKSON, his little sister, are about to get kicked out of boarding school ... again. And that's the least of their troubles. Lately, mythological monsters and the gods of Mount Olympus seem to be walking straight out of the pages of Percy and Lillian's Greek mythology textbooks and into their lives. And worse, they angered a few of them. Zeus's master lighting bolt has been stolen, and Percy and Lillian are the prime suspects. Not to mention Lillian is only 5 but is as smart as her 12 year old brother.
Now the Jackson kid's and their friends have just ten days to find and return Zeus's stolen property and bring peace to a warring Mount Olympus. But to succeed on their quest, Percy and Lillian will have to do more than catch the true thief: they must come to terms with the father who abandoned them; solve the riddle of the Oracle, which warns them of betrayal by a friend; and unravel a treachery more powerful than the gods themselves.

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Credits to Rick Riordan for the summary and plot
I only own Lillian Jackson