The album was recorded at Studio Cobra in Stockholm in March 2013 and was produced and mixed by Martin "Konie" Ehrencrona.

It recalls 70s Judas Priest's more bittersweet moments, a casualty of the group's success in the 80s, or a more serious stab at April Wine's 'Sign of the Gypsy Queen'.

In Solitude are a young band—Palm is the oldest member at 26—and for them to craft a song filled with weariness and whiskey-afflicted love is a stroke of 'Old Man'-like brilliance."

Erik Highter of PopMatters was positive about the album, awarding it an 8/10 and concluding that "Sister is the sound of a band growing and coming into their own, drawing on disparate influences inside and outside the genre.

was likewise positive about the album, awarding it 7/10, writing that "Dark and syrupy in tone, with just the right amount of haze, as if from sacred smoke, Sister is a fine addition to the witchy, ritualistic hard rock that's leaving an ever-darker mark on aggressive music."