Billie Eilish does not have a Sister. She only has a brother, and his name is Finneas. There is a lot of speculation on the internet claiming Billie Eilish has a sister, but it is incorrect.
Billie and Finneas’ Relationship
Billie and Finneas are extremely close and have been since they were young. He played a huge part in Billie’s successful career because he co-created the songs that made her a superstar.
So why all the speculation about Billie having a sister? Well, one reason is that some people thought Claudia Sulewski was related to her since she is seen in some of Billie and Finneas’ social media posts. Turns out, Claudia is Finneas’ girlfriend!
Whether or not Billie has a sister is no longer up for debate. The fact of the matter is that she doesn’t, and never has. She only has a brother named Finneas, who is her best friend and collaborator. Next time you see her with someone else in a social media post, don’t assume they’re related – they’re probably just friends!