What did you call your grandparents? What do your kids and/or their kids call theirs?

We called my dad's mother "grandma" and we referred to my dad's stepdad as "her husband".  

We called my mom's parent's "grandma and "grandpa T".  

We didn't have a good relationship with any of them.

I don't have kids, so ...

We called them Grandma and Grandpa (last name).  

I called them Grandma/Grandpa (First Name)
My kids same thing with Grandmas but one wanted to be Nana not Grandma...they only had one living Grandpa who they call Papaw. 
My grandkids say Nana and Papaw. 

I only knew my maternal Grandmother and only met her a few times. I called her grandma. I am Grandpa to my blood grandkids. My step-grandson calls me Papa.

Grandmom and Pawpaw.

My grands call me Nonnie.