If you like Battle of the Labyrinth by Rick Riordan

Here are some other
books with a mix of magic, fantasy, family, adventure, and/or mythology
that I think you may like:


Pirate Curse (Wave Walkers, book 1) by Kai Meyer.

In a place similar to the 1706 Caribbean, two fourteen-year-old
"polliwogs"--humans who can walk on water--rely on a mysterious figure
known as the Ghost Trader and a band of pirates to help them escape from
the evil that is chasing them.


The Night Tourist by Katherine Marsh.

After fourteen-year-old classics prodigy Jack Perdu has a near fatal
accident he meets Euri, a young ghost who introduces him to New York's
Underworld, where those who died in New York reside until they are ready
to move on, and Jack vows to find his dead mother there.


The Shadow Thieves (Cronus Chronicles, book 1) by Anne Ursu.

After her cousin Zee arrives from England, thirteen-year-old Charlotte
and he must set out to save humankind from denizens of the underworld,
Nightmares, Death, Pain, and a really nasty guy named Phil.


The Akhenaten Adventure (Children of the Lamp, book 1)by Philip Kerr.

When twelve-year-old twins Philippa and John discover that they are
descended from a long line of djinn, their mother sends them away to
their Uncle Nimrod, who takes them to Cairo where he starts to teach
them about their extraordinary powers.


The Witch's Boy by Michael Gruber.

A grotesque foundling turns against the witch who sacrificed almost
everything to raise him when he becomes consumed by the desire for money
and revenge against those who have hurt him, but he eventually finds his
true heart's desire.