McKinnon akaberekwa uye akakurira muLong Island guta reGungwa Cliff, New York kuna Laura Campbell, mubereki mudzidzisi, uye Michael Thomas Berthold, mugadziri. Ane hanzvadzi duku, Emily Lynne. Baba vake vakafa paakanga ava nemakore 18. Semwana, McKinnon akaridza zviridzwa zvinoverengeka. Akatanga kuridza piyano paakanga ava nemakore 5, cello paakanga ava nemakore 12, uye akazvidzidzisa kutamba gitare paakanga ava nemakore 15.
Mutambo Wetii