no.
Your grandmother's spaghetti sauce epitomized the sense of taste my uncle championed.
Yes, the sentence "you saw your uncle and aunt come out" is grammatically correct. It describes the action of seeing both your uncle and aunt exiting from a place.
Your grandmother's uncle is your child's great great uncle.
Grandmother. "Brother", "uncle" and "father" are all male. "Grandmother" is female.
your great uncle your grandmother's brother is your parent's uncle.... and confusingly enough when your parent is related to someone of the generation older than them (their uncle) it becomes your (great uncle) great relative.
"My Uncle John said" is not a complete sentence. It doesn't tell us WHAT he said.
Your grandmother's brother is your great uncle.
Cousin
Your great grandmother's brother is your great great uncle.
Your grandmother's brother is your great uncle.
Your grandmother's brother is your great uncle. Your great uncle's grandchildren are your second cousins.
You and the granddaughter of your grandmother's brothers, and sisters, are first cousins.
Your Grand Uncle(great uncle) would be your grandmother or grandfathers brother.