I would let them stay at home as long as they were not left in their crates the majority of the time. If I were you I'd set up a room that you could let them stay loose in (after making sure there were nothing in it that they could get hurt by. At night maybe your FIL could come by and crate them for bedtime. But leaving them in the crates for such a long time and then being out of them for only an hour or so at a time is not a good idea. Imagine yourself in their paws. :-)