A whanau trust had written to Mr Tarawhiti complaining about the descendancy claims.
Mr Wasley said the trust was considering its legal options.
Another descendant from the north, Nadene Pehi, said asking him politely to stop hadn't worked.
Mr Tarawhiti said it was "correct" to say he wasn't a direct descendant but he had always been open about his link, including in front of Taranaki, Ngapuhi and Te Arawa iwi at tribal functions honouring Guide Sophia.
"My choice of words that I use is descendant ... through the tuakana [older brother] of my koroua [grandfather] I feel I am justified in using that word."
He claims descendants have told him: "He whanaunga, he mokopuna, engari kare he toto. [You're a relation, a moko but not of the bloodline.]
"I've got the backing of all my family. I'm going to continue on. The letters they [the trust] sent, they have no significance to me."
Guide Sophia
* Born 1830/1834, died 1911.
* Ngati Ruanui.
* Principal guide at Lake Rotomahana's Pink and White Terraces.
* On the night of the 1886 Mt Tarawera eruption, Sophia sheltered 62 people in her whare at Te Wairoa.
* Married Koroneho Tehakiroe from the Hokianga about 1851. Had 14 children.
* Married Hori Taiawhio from Te Arawa about 1870. Had three children.
Source: Jenifer Curnow, Dictionary of New Zealand Biography. Te Ara - the Encyclopedia of New Zealand.