Seems his brother was also in the family business of aviation: https://en.wikipedia.org/wiki/Hezârfen_Ahmed_Çelebi https://en.wikipedia.org/wiki/Hezârfen_Ahmed

Seems his brother was also in the family business of aviation: https://en.wikipedia.org/wiki/Hezârfen_Ahmed_Çelebi https://en.wikipedia.org/wiki/Hezârfen_Ahmed_Çelebi