No one; go by yourself.

After a moment's thought, you decide it's probably best to do this alone. After all, the slaves here all know anyone from the household you might ask to accompany you; perhaps it's best that you interrogate them by yourself, so their reception of you isn't clouded by those other relationships. Decided, you nod to yourself and pull on your toga before heading out of your room. After a brief bite for breakfast, you head out into the fields to interview the slaves.