Definition
Either your parents' parents' parents (your most senior relatives), or an exceptionally cool and generous grandparent who actually remembers what it's like to be young.
Example Usage
"My great grandparents just turned 90 and 88βI should definitely call them more often."
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Great%20grandparents&defid=17890920)
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