TTC and the holidays

So I really thought this last cycle was the one but stupid AF proved me wrong. So now I'm planning and prepping for the next round. I have a 35-37 day cycle so this month my ovulation is going to fall right around Thanksgiving. And unfortunately we will be traveling and staying at my husbands grandparents house with 15 other people where we may or may not have our own bedroom and if we do our 2 year old will be in there with us. We will be there most of the week. I have no idea how we are going to subtly sneak away to make this happen! If we just go missing in the middle of the day someone is guarenteed to notice if for no other reason than they are left to keep an eye on our daughter. Anyone have some good sneaky sex tips for doing it with a house full of people and almost no private space (hotel isn't gonna be an option). Best thing I can come up with so far is shower sex. It wont be super inconspicuous but at least its private.