The word "grandpa" typically refers to a person's father's or mother's father, who is a senior member of the family and often older than their parents. Full definition
You can view a few older photos of grandpa above with my Elizabeth when she was younger. (garaytreasures.com)
But Gus isn't just for grandpas in rocking chairs anymore. (thestir.cafemom.com)
Remember when grandpa used to complain that the CDs you bought him didn't sound like his old vinyl records, claiming their hissing and fuzzy static added to the ambience? (wegotthiscovered.com)