Older one calls me Mama and her dad Papa. Choti calls me mummy and her dad, Paapee or Daddy.
Me too!! Well most of the time. It's almost always Mama (pronounced maa-ma as opposed to muh-ma). But if I'm unhappy or trying to express my displeasure, it'll become Mother.
For my dad, it's usually Papa, but if I'm trying to ingratiate myself or wheedle something out of him - it'll be Daddy.