The study examines how members of the historically white possessive and supremacist Church of Jesus Christ of Latter-day Saints in the United States (mis)appropriated Māori genealogy, known as whakapapa. The Mormon use of whakapapa to promote Mormon cultural memory and narratives perpetuates settler/invader colonialism and white supremacy, as this paper shows. The research discusses Church racism against Native Americans and Pacific Peoples. This paper uses Anthropologist Thomas Murphy’s scholarship to demonstrate how problematic the Book of Mormon’s religio-colonial identity of Lamanites is for these groups. Application of Aileen Moreton-Robinson’s white possessive doctrine and Hemopereki Simon’s adaptation to cover Church-Indigenous relations and the salvation contract is discussed. We explore collective and cultural memory and discuss key Māori concepts like Mana, Taonga, Tapu, and Whakapapa. A brief review of LDS scholar Louis C. Midgley’s views on Church culture, including Herewini Jones’s whakapapa wānanga, is followed by a discussion of Māori cultural considerations and issues. The paper concludes that the alteration perpetuates settler/invader colonialism and Pacific peoples’ racialization and white supremacy. Genetics science and human migration studies contradict Mormon identity narratives and suggest the BOM is spiritual rather than historical. Finally, the paper suggests promoting intercultural engagement on Mormon (mis)appropriation of taonga Māori.