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Grandfather = Abuelo
"Abuelo" is a grandfather and "Abuela" is a grandmother
Grandmother in Spanish is 'abuela'. Thus, the word for grandfather is 'abuelo'.
abuelo
It means grandfather/grandfathers
abuela - grandmother abuelo - grandfather
If your great grandfather was Spanish, your ethnicity would likely include Spanish heritage.
There is no such language as "Mexican". The language principally spoken in Mexico is Spanish. The Spanish word for Grandfather is "Abuelo". "Abuelito" is also acceptable as a more endearing term that literally means "little grandfather".
The singular possessive form of the word "grandfather" is "grandfather's."
Abuelo
The word for grandfather in Basque is "aitxitxe."
The word "grandpa" is short for grandfather.