for Alien Encounter by Charise Mericle Harper
From the Publisher
Nine-year-old Morgan is fascinated with aliens. He lives in the Pacific Northwest, land of the sasquatch, and naturally is fascinated with those as well. When he meets new kid Lewis, whose parents own a motel named the Stay On Inn, the adventures begin with slingshots, underpants, annoying older sisters, and neighbors dressed up in bear suits.
Publisher description retrieved from Google Books.