Here's hoping after all this time you somehow see this!
I'm not sure if there's a relation, but I've seen Lapwai come up a few times while researching family history. My great-great grandfather was James M Holt and he married Mary Jane Adams, whom was Nez Perce on her mother's side. They had several children including my great grandfather, James (Jim) Lee Holt. Jim Holt at some point left the states and came to Canada. I understand he was running from the law, but I haven't managed to corroborate this yet.
I have a list of siblings and children for Jim that I still need to add in to my tree.James M Holt died in Orofino and his wife died later in Lewiston.