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The 17-year-old's mother, Misao, plays piano; older brother Leon (21) plays trombone, French horn and violin; older sister Sophelia (19) plays violin and flute; and younger sister Serenity (13) plays violin, trumpet, cornet and bugle.
Sebastian has been playing the trombone since he was 11, and now the Kavanagh College year 13 pupil has been selected as first trombone player in this year's National Secondary Schools' Brass Band.
He is one of four southern musicians selected for the band, the others being Florence Mckenzie (15, third cornet), Brianna Loan (14, second tenor horn) and Darcy Herrick (15, percussion), who are all pupils at James Hargest College, in Invercargill.
The band is made up of secondary school pupils from around New Zealand.
Sebastian said that he was "pretty stoked" to have secured a spot on his first time auditioning.
The process for auditioning was a bit frustrating, he said.
Applicants needed to record themselves multiple times, playing music provided by the association, until the applicant was happy with the results.
Next year he planned either to study music performance at the University of Otago or fashion design at Otago Polytechnic, Sebastian said.
Whichever he chose, he would never stop playing music.
"I do it because because it's good for me - it's good to keep playing. If you're not playing, you're not getting any better."
- Fisi-Belle Carrasco-Rex