I will try to answer your original question: Kalispel Tribe of Indians, Usk, WA. Check out threir website at www.kalispeltribe.com. The site has a place to leave messages and their regular mailing address. I would recommend you send your message 'attention Probate.' Also, make it very clear that you are looking for family information, but not fishing for enrollment. Their tribal government is fairly small, it may take some time for some one to get back to you.
The Indians who live by Lake Kalispel in Montana are the BLACKFEET.......