Your parent and your grandfather's sister's child are first cousins. You and your grandfather's sister's grandchild are second cousins. There is a generation out of synch, so they would be second cousins once removed.
The people who most likely inspired Avi are his grandfathers and his grandmother.
Your grandfather is going to be the parent of your father or your mother. Most people have two grandfathers. In families where there has been divorce, there could be multiple individuals referred to as grandfather.
Two people who have the same great grandmother are second cousins to each other. Two people who have the same grandparent are first cousins.
Two people whose grandfathers were brothers are second cousins to each other.
When one person's great grandmother is the another person's great aunt, the relationship between the two people is that of second cousins, once removed.
You make the answer he is your grandfather how will we know
Grandfather, grandad, grandpa..depends on the person
If the great grandmother of one person was the great great aunt of another, the two are third cousins to each other.
Your grandmother and your wife's grandmother are not related to each other because you are married to your wife. Especially in small communities, it is possible that they might be related to each other for other reasons. The only way for you to know for sure is to get genetic testing done or do a family tree. Ask other people in the family.
Old people were strong in their beliefs
Scottish people would call their Grandmother 'Granny'.
claudius's grandmother was usually poisoning people who get in the way of herself and her own family