The story
- Englishgreat-
- Englishgrand-
- Proto-Indo-European*sew-?
- Proto-Indo-European*sewH-
- Proto-Indo-European*suHnús
- Proto-Germanic*sunuz
- Proto-West Germanic*sunu
- Old Englishsunu
- Middle Englishsone
- Englishson
- Englishgrandson
- English todaygreat-grandson
Etymology from Wiktionary, CC BY-SA 4.0.