Your uncle (your Mother or Father's brother) is closer.
My great-grandma
my nephew had a baby...his mother is my sister...she is now a grandma which "should" make me a granduncle...and our mother is now a great grandma which "should" make her brother a great grand uncle.
great-grandma great-uncle great-grandpa great-aunt
its either your grandma or great aunt
It's your cousin. Lets say: Grandma Wilma has a brother Bill. Bill is your great Uncle. His daughter Joan is your parent's First Cousin and your First Cousin, once removed.
A niece or nephew is the child of an aunt's or uncle's brother or sister. So the parents of the aunt/uncle and of the niece's/nephew's parents are the same people - their grandparents. The grandmother of the aunt or uncle is the great grandparent of the niece or nephew.
Her great grandma.
Could be your Grandmother too if she is the mother of the brother or sister of your father or mother. If she is the mother of the spouse of a person married to the brother or sister of your father or mother, then there is really no relation.
If its Aunt by full blood then you related both same 50%.
Your grandma's brother is your parents' uncle, so he is your great uncle. if he got married and had a son, then your parents now have a cousin. People with the same grandparents are first cousins. People with the same great grandparents are second cousins. This man is one generation away from you, so he is your second cousin, once removed.
The mother of one of your grandparents is your great-grandmother.The colloquial is "great-grandma" e.g. "Great-grandma Smith."
A Grand Uncle is the brother of a Grandma or Grandpa. The Grandma/Grandpa refer to their children by first name but from the Grand Uncle perspective they are his niece and nephew. The next generation is known as the grandchildren which are known as Grand-Nice/Grand-nephew to the Grand Uncle. Grand simply refers to two generations removed starting from the Grandparents and Geat-Grand ____ refers to three generations removed starting from the Great-Grandparents.