I am a teacher librarian from Florida, who every year creates book trailers for the SSYRA of Sunshine State Young Reader Award Books.
This is author Clete Barrett Smith's novel " Aliens On Vacation". Book Trailer by M. Harclerode.
Scrub[David] discovers that his grandmother is running an inn for aliens, allowing them to vacation on Earth. The town sheriff is suspicious of Grandma, and with one wrong move, Scrub could blow her cover, forcing the B&B to shut down forever. Book #1.