"You and Your Sister" is a song by the American singer-songwriter Chris Bell, that appears on his only solo album I Am the Cosmos.

Comparisons have been made to Big Star's "Thirteen", which Bell co-wrote with bandmate Alex Chilton,[1] and is also an acoustic love ballad.

Mark Deming of AllMusic described it as a "sweet, guileless love song" that "represents the sincerity and emotional innocence that Bell brought to his brief tenure in the band Big Star" that "make[s] more emotional sense than literal sense" [2] and as "one of the great unknown love songs in the pop canon, a luminous and fragile ballad almost otherworldly in its beauty.

[3] The song is included in the 2009 Big Star box set Keep an Eye on the Sky.

[4] "You and Your Sister" was covered, along with "I Am the Cosmos", by This Mortal Coil on the 1991 album Blood.