I feel like I kind of dance around it a bit because I'm afraid of making a cultural faux pas. They seem fine with me calling them by their first names and that's how my MIL signs her emails to me but that doesn't seem right. Together, they sign all their cards "amma and appa," and my FIL always calls me his daughter not daughter in law and he signs his emails "appa." What to do what to do?? (I am visiting them in a few weeks!) And no, my husband is no help at all.