We all call our MIL Ammi...but the husbands all call our moms Aunty and Uncle.
haha thats exactly what I've seen in my family....I called my in-laws Aunty and Uncle before we got engaged because we were family friends, but right after my engagement, I started calling them what my husband calls them. that was taboo for my extended family, have you guys seen that? Is it wrong to call them Ammi/Abbu if you're engaged and not married?
My husband calls my parents Aunty and Uncle....my dad did the same with my Nana and Nani.