According to Kaeo Weekes in tonight's episode of The Fan, his grandfather is former St. George & Parramatta player Geoff Weekes.
Geoff:
https://www.rugbyleagueproject.org/players/geoff-weekes/summary.html
Kaeo:
https://www.rugbyleagueproject.org/players/kaeo-weekes/summary.html
Alternative sources:
https://en.wikipedia.org/wiki/Kaeo_Weekes
https://x.com/codenrl/status/1967007894567890984