nan/nannaBritish EnglishBrE informal grandmother – used especially by children
She's staying at her nan's.
You can have a cuddle on the sofa with Nanna.
Examples from the Corpus
grandparent• Every human being has two parents, four grandparents, eight great-grandparents, sixteen great-great-grandparents, and so on.• I missed my grandparents desperately and longed for Pam.• My grandparents live in Oregon.• The role of grandparents is to give time and unconditional love.• This can be an aunt or grandparent or some other family member.• Across Route 22, in Union, my other grandparents sat choked in tinsel.• Our grandparents, then, Roman and Fenya Lubetkin.• My five-year-old godson's grandparents brought him a small, frameddrawing for his christeningpresent.