Former Maori members' chairman Shane Te Pou has written to the party demanding his personal data be removed from Labour's database of home buyers, which it claims is the same information leaked from Barfoot & Thompson.
Te Pou cited the Privacy Act in the letter after being told by the estate agency that the purchase of his family's house was likely among those used to bolster statistics purporting to show people in China were buying up New Zealand houses.
Te Pou is married to Annie Du, who is of Chinese ethnicity. He told the Herald his wife's name was used to buy the family home during the period covered by Barfoot & Thompson sales data, obtained by Labour.
He said the information had been released from Barfoot & Thompson through a staff member to the Labour Party in a way which was "certainly unlawful".
"The use of it to describe Maori New Zealanders as Chinese, 'foreign money', and the cause of a housing problem is certainly unfair."
He wrote to Little telling him one of his children asked: "Daddy, why are people angry at Chinese."
"This demonstrates that actual harm has been caused to our family."