We do what we have to do for our kids and our grands. The only time I ever lit into my SIL was for spanking one of MY grands. Your whole world has been turned upside down, but it will level out. In the meantime, your "me" time has been deleted. I think I would try to sew placemats, or table toppers, or something small while they nap. You know, just a little something to prove to yourself that you're still here! In the meantime, sending prayers your way.