There are 3 books in the The Intergalactic Bed and Breakfast series. The newest book is Aliens in Disguise which came out in 2013.

13-year-old David discovers that his grandmother's inn is a portal for comical aliens from all over the universe---a secret that, until now, she has been able to keep from her small town.

Scrub isn't happy about having to spend the summer with his hippie grandmother in "Middle of Nowhere," Washington.…
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Book cover of Alien on a Rampage
David is looking forward to spending another adventure-filled summer at his grandmother’s Intergalactic Bed & Breakfast—a vacation hotspot for aliens. But as soon as he meets Grandma’s new repairman, an alien named Scratchull, he becoms suspicious. The only problem is that it is difficult to be sneaky when you have…
Book cover of Aliens in Disguise
When David's grandma wins a hotelier award and goes to accept it on another planet, security officer Tate assumes full control of the Intergalactic Bed & Breakfast. His decision to put the alien tourists on total lockdown doesn't go over well, however, and most of the guests vacate. Tate decides…