The story
- Englishgreat-
- Proto-Indo-European*gʰer-
- Proto-Germanic*grautaz
- Proto-West Germanic*graut
- Old Englishgrēat
- Middle Englishgrete
- Englishgreat
- Englishgrandmother
- English todaygreat-great-grandmother
From great- + great + grandmother.
Etymology from Wiktionary, CC BY-SA 4.0.