My great grandparents were Big Grandpa/Little Grandma and Grandma Boelter (on my dad's side). My grandparents were just Grandpa and Grandma on my dad's side... Granny and Grandpe (his nickname was Pete - so Grand-pea) on my mom's side.
For my son - Grandpa Kuch (kuchenbecker is our last name) and Marina on hubby's side... Marina is FIL's second marriage and when Jake was born, she refused to be called Grandma, she wasn't old enough to be someone's grandma. So when her grandson was born a year later from a previous marriage, then she wanted Jake to call her Grandma... no. But we have called her babushka when she isn't around - she is Russian.
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My mom is Grammy and my step dad is Grandpa D. My dad is Grandpa Johnny.
When Jake has kids - I want to be called the Queen Mum. hahahaha