NikkieTutorials' brother Mikai passed away in 2018.
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NikkieTutorials: 18 facts about YouTuber Nikkie de Jager you need to know

12. NikkieTutorials' brother Mikai passed away in 2018.
NikkieTutorials has two brothers. In 2017, Nikkie revealed that her younger brother Mikai had been diagnosed with lymphatic cancer aged 13. Sadly, Nikkie confirmed that Mikai had passed away in May 2018. [@NikkieTutorials via Twitter]