Seconding dews. I'd avoid this. It isn't that it's impossible to get adult POVs published in MG. I've read a few recent examples. It's that it's yet another hurdle to get over as far as feeling relatable to the MG audience, and you'll get rejections for this issue alone. Big-name authors are allowed to do things the rest of us may not be, because they are proven sellers. I've come to believe that this road is hard enough without adding elements to a book that are going to be a hard sell from the get-go. Is there some reason all the owners can't be kids?