I am curious to hear how you address your parents informally in your language? I love learning these little nuances that unite us all. In Ireland, there is a division between East and West-Dubliners call their parents Ma and Da, the Midlands use Mammy and Daddy and the West use Mam (pronounced Mom, from the Irish Mamaí, not the US) and Dad.
Some posh people might use Mum but that’s more of an English thing.
Grandparents are Granny and Grandad, Mamó and Daideo in Irish speaking regions. People with notions use Nana.
Inform me! We are all the same at the end of the day!