Sister is the second studio album by British experimental rock trio Ultraísta.

[6] It was released immediately prior to the worldwide COVID-19 pandemic, leading to the album's promotional roll-out, touring, and subsequent interviews being affected.

[8][9] "Ordinary Boy" was released as a single in September of 2020 along with a remix EP following on 6 November.

[10] An additional extended play, Sister Remix EP, for the album released on 12 March 2021, featuring remixes from Zero 7, Grenda, Portico Quartet, Erland Cooper, and Harvey Causon.

[11] A half-hour short film, entitled Sister, was directed by Nigel Godrich and released featuring the four singles from the album and lead singer Laura Bettinson walking throughout London, with cameos from Godrich and Joey Waronker.