"Sister" is a 2019 single by German duo Sisters. The song represented Germany in the Eurovision Song Contest 2019 in Tel Aviv, Israel after winning Unser Lied für Israel, Germany's national final. In the final, the song would earn a 25th place finish, earning 24 points, all coming from the jury vote.

Laurell Barker, also known mononymously as Laurell, is a Canadian singer and songwriter currently residing in Malmö, Sweden. She has co-written songs with numerous artists, including Twice, Eleni Foureira and Oh My Girl. She is also known for co-writing songs competing in the Eurovision Song Contest and its national selections.