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Spanish word abuela comes from Latin -olus, Proto-Indo-European *h₂ewh₂-, and later Latin avus (An ancestor. An old man. Grandfather.)
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-olus (Latin)
*h₂ewh₂- (Proto-Indo-European)
avus (Latin)
An ancestor. An old man. Grandfather.
*aviolus (Latin)
(Vulgar Latin) grandfather.
abuelo (Spanish)
(colloquial, affectionate) an elderly person. Grandfather. Loose tufts of hair in the nape when one's hair is messed up.
abuela (Spanish)
Grandmother,.