Relatives of Georgina Harris Ngapuhi

Searching on behalf of Shane GERMON (born May 1973 in South Auckland). Shane is the son of Georgina HARRIS and younger brother of Morgan. We don't have a lot of information but know he is of Ngapuhi descent. We both remember Aunty June HARRIS/EDMONDS who lived in Otahuhu for a while on Nikau Road(?). Also Ngati EDMONDS who lived in the South Island but remained on the Nthn Maori electoral roll. Shane remembers when he was about 13 or 14, Ngati came to see him where he was living in Christchurch to check that he was okay.
Georgina went to live in Holland when Shane was a few months old. Pretty sure her family were based in Dargaville in the 1960s.
If anyone can help we would really appreciate it. Shane hasn't seen Morgan since he was a kid and would love to connect, and to learn his whakapapa to share with his little girls.