Well dinner is about to be served.  Slaves will be expected to sit on the floor, I am thinking there will be a special area for them, away from the main table but close to it, they will be expected to eat properly, using the correct implements.  Being watched by a maid and a footman, so you could have Louis bring his sister in and place her at the slaves table, he could then be the one on duty to watch them today.  If thats ok :)