[lengel]

Definitely crate your dog during human meals. Unless your grandfather is interested in the latest and greatest on dog behavior or the concept of boundaries or pretty much anything that's come down the pipe in the last fifteen years, it doesn't make sense to try to teach him in the short time period that you have. He's just trying to bond with your dog in the way that his generation understands. You can, however, make sure that your dog succeeds and that's what you need right now.