- Daughter of William Hart (b. 1952) and Lisa Hart.
- Younger half-sister of Melissa Joan Hart (b.1976), Trisha Hart (b.1978), Elizabeth Hart (b.1980), Brian Hart (b.1984) and Emily Hart (b.1986).
- Half-aunt of Mason Wilkerson (b.2006), Braydon Wilkerson (b. 2008), Tucker Wilkerson (b. 2012), Christopher Savage (b.2004), Jonathan Savage, Aviana Louise Portillo (b.2016), Will Dusan Mader (b. 2017) and Isabelle Francesca Hart (b. 2017).
- Granddaughter of Ethel Hart.
- Half sister-in-law of Mark Wilkerson (b.1976), Warren Savage, Alex Madar, Giovanna Augello and Josue Portillo.
- Mackenzie was born on December 29, 1997 in West Sayville, New York, USA.
- Her hobbies are, reading, photography, learning, traveling, internet surfing.
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