Do you know young grandparents?

This woman is not the mans wife, shes his 53 years old mom and they are with his daughter, her granddaughter
This woman is not the man's wife, she's his 53 years old mom and they are with his daughter, her granddaughter

Young as in, under 55?

My mother is 45 and adores both my daughter and my sister' son, but she gets really angry if I call her "grandma" - she says she's too young and even then only my daughter and my nephew will be allowed to call her that when they'll talk.

Do you know young grandparents?
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