Sister (Sister2Sister song)

In Australia, the single was a huge success. It debuted on the ARIA Singles Chart at number 14, then after several weeks climbed inside the top 10; it peaked at number three on 12 December 1999.^[2] It spent a total of 20 weeks inside the top 50.^[2]

In New Zealand, the single debuted on the RIANZ Singles Chart at number 14 and fell out quickly, spending eight weeks in the top 50.^[3] Two weeks after leaving the top 50, it re-entered at number 26, then fell and rose for a further five weeks before exiting for the last time, bringing its week total to 14.^[3]

On the UK Singles Chart, "Sister" debuted at number 18, before falling 17 places the next week.^[4] It spent two more weeks in the top 100, bringing its total weeks to four.^[4] In Ireland, the song spent one week in the top 50, reaching number 50, then dropped out the next week.^[5]

Australian CD single^[1]

1. "Sister"
2. "Wait"

Australian remix CD^[6]

1. "Sister" (Single mix)
2. "Sister" (Urban Radio Mix)
3. "Sister" (Platform 73 Mix)
4. "Sister" (La Funk Mix)
5. "Sister" (London House Mix)

UK single^[7]

1. "Sister"
2. "Sister" (Urban Radio Mix)
3. "Wait"

UK cassette single

1. "Sister"
2. "Sister" (Tuff Sister Mix)