The Chronicle Gate: Ethereal (The Chronicle Gate Saga Book 1) by N Lang
What if you woke up on a strange planet?
On Ethereal, Elousen kids discover a human child from Earth and take him in while their dad, Jasper, tries to find this unknown planet. Meanwhile the kids discover a plot by the Mer-Dragon to try to capture Jasper and now the kids must find a way to help him. Even if that means soaring across the galaxy!