Well, the stepson's GF heard from her Mom today.
Their house is still standing.
She said it's a bit scorched, and the deck is gone along with all of the outbuildings, but the house itself appears intact.
Her parents haven't been allowed back in the immediate area yet, so they don't know if it's habitable or not, but at least it's still there.
She's headed back today to help with the mountains of paperwork that come with a loss like this.