Very politely.
Probably Mama and Pa.
In a very formal way
late parents
Parents can call their children whatever they want. Regardless of what they've changed their names to, they're still their children.
Childless
mum and dad
MAMMY AND DADDY
Mamma=Mother Pappa=Father Föräldrar=Parents
to call their parents in emergencies.
Penis and Buttsack
Young children and some older children call their parents either mommy or daddy. But most of the time grown-ups usually call their parents mom, dad, ma, and pop.
Children during World War 1 did in fact call their parents Mummy and Daddy. There have been many variations of what children have called their parents including; Mom and Dad, Mommy and Daddy, Mother and Father.
I think they call them Amma and Appa but I'm not quite suree :/
It is very useful. When children get lost, they can use their phones to call their parents. When they forget their homework, they can also call their friends for help.