The 'mum' and 'dad' group
These nouns are used to address a relative. Some are formal and some are informal. They are often spelled with a capital letter.
aunt auntie dad daddy father gran grandad grandaddy grandfather grandma grandmother grandpa granny kids ma mam mama mamma mammy mom momma mommy mother mum mummy nan pa papa pop uncle
I'll be there in a minute, Dad.
Oh, Grandma, that's so sweet.
Don't go on, mum.