Student or Learner
Is this qustion formation correct and please correct it grammatically:
The one at whose place you stay is your paternal or maternal grandmom?
When can we use paternal and maternal
Without disagreeing at all, in casual conversation, we are more likely to say (in the US) is that on your mom's side or your dad's?
You wouldn't usually say "My maternal great aunt is having her 90th birthday next week" but "A favorite great aunt from my mom's side..." -- assuming you thought it was important for your listener to know which side of the family it was on.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
...or 'my geat aunt on my mother's side. This is a bit of a mouthful though, so in Br Eng we use 'maternal/paternal' quite colloquially. In the world of genealogy 'on the mother's side' becomes 'on the distaff side'. (The distaff is the stick used to hold spun yarn when spinning - so feminist genealogists are in a bit of a bind! )