Kaminsky was born in Lisle, Illinois to parents Frank and Mary in 1993. He has two sisters, three step-sisters and a step-brother. Kaminsky was exposed to basketball early on, as his aunt and uncle worked with the Chicago Bulls in 1998 and he had access to the practice facility at the age of five. Kaminsky later attended Benet Academy, where he was named first-team all-state by the Chicago Sun-Times after leading the Redwings to a 29-1 record his senior season. He went on to attend Wisconsin for four years, graduating with a degree in life science communications. You can follow Kaminsky on Twitter (@FSKPart3) and Instagram (@fskpart3).