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Amy Sussman/Getty

02of 06Billy Eilish/Instagram"MY BROTHER IS MY BESTFRIEND AND WE DID SNL LAST NIGHT AND IT WAS A PEAK LIFE EXPERIENCE," Billiewroteon Instagram of her brother and their milestone moment. “WOW. THANK YOU LIFE FOR GIVING ME WHAT I HAVE.”
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Billy Eilish/Instagram

“MY BROTHER IS MY BESTFRIEND AND WE DID SNL LAST NIGHT AND IT WAS A PEAK LIFE EXPERIENCE,” Billiewroteon Instagram of her brother and their milestone moment. “WOW. THANK YOU LIFE FOR GIVING ME WHAT I HAVE.”
03of 06FINNEAS/Instagram"You’re my reason. For everything," Finneaswrotefor his sister’s 18th birthday. “Happy birthday, I love you more than life itself.”
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FINNEAS/Instagram

“You’re my reason. For everything,” Finneaswrotefor his sister’s 18th birthday. “Happy birthday, I love you more than life itself.”
04of 06Jeff Kravitz/FilmMagic"Finneas is my best friend, my big brother," Billie began, as she acceptedVariety’s Hitmaker of the Year awardin 2019. “He’s four years older than me and we’ve been best friends kind of forever. We started writing music together when I was 13 and he was 18 or 17 and he produces everything. He’s the only reason I’m anywhere in the whole world. He’s probably the only reason I’m alive.”
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Jeff Kravitz/FilmMagic

“Finneas is my best friend, my big brother,” Billie began, as she acceptedVariety’s Hitmaker of the Year awardin 2019. “He’s four years older than me and we’ve been best friends kind of forever. We started writing music together when I was 13 and he was 18 or 17 and he produces everything. He’s the only reason I’m anywhere in the whole world. He’s probably the only reason I’m alive.”
05of 06Lester Cohen/GettyFinneas joined Billie on stage as she accepted her award to say, “I would just like to thank Billie for being naive in her trust of a 17-year-old who had no idea what he was doing, who was incredibly ambitious and thought every idea that I had was the best idea.““I couldn’t be more proud of every song that I’ve made with you,” he continued. “There’s a lot of bulls— articles about me now, about how I’m ‘not just Billie Eilish’s brother’ - and just being Billie Eilish’s brother is all I ever want to be.“He concluded: “I love Billie more than anybody else and I’m so grateful to you. I love you.”
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Lester Cohen/Getty

Finneas joined Billie on stage as she accepted her award to say, “I would just like to thank Billie for being naive in her trust of a 17-year-old who had no idea what he was doing, who was incredibly ambitious and thought every idea that I had was the best idea.”
“I couldn’t be more proud of every song that I’ve made with you,” he continued. “There’s a lot of bulls— articles about me now, about how I’m ‘not just Billie Eilish’s brother’ - and just being Billie Eilish’s brother is all I ever want to be.”
He concluded: “I love Billie more than anybody else and I’m so grateful to you. I love you.”
06of 06Billy Eilish/Instagram"HIS IS MY BIG BROTHER AND MY BEST FRIEND. I WOULD BE PRECISELY NOTHING WITHOUT HIM. HE IS MY WHOLE WORLD AND I WOULD DO ABSOLUTELY ANYTHING FOR HIM. ANYTHING ANYTHING ANYTHING,” Billie wrote of her big bro on his 21st birthday. “@finneasoconnell i love you i love you i love you i love you happy birthday perfect boy.”
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“HIS IS MY BIG BROTHER AND MY BEST FRIEND. I WOULD BE PRECISELY NOTHING WITHOUT HIM. HE IS MY WHOLE WORLD AND I WOULD DO ABSOLUTELY ANYTHING FOR HIM. ANYTHING ANYTHING ANYTHING,” Billie wrote of her big bro on his 21st birthday. “@finneasoconnell i love you i love you i love you i love you happy birthday perfect boy.”
source: people.com