1. Beyonce and Solange Knowles: Beyonce is a renowned American singer, songwriter, actress, and record producer. Her younger sister, Solange Knowles, is also a talented singer, songwriter, and actress.
2. Mariah Carey and Alison Carey: Mariah Carey is an American singer, songwriter, record producer, and actress. Her older sister, Alison Carey, is also a singer and has released several albums.
3. Norah Jones and Anoushka Shankar: Norah Jones is an American singer, songwriter, and pianist. Her half-sister, Anoushka Shankar, is a sitar player, composer, and producer.
4. Venus and Serena Williams: While not traditionally known for their singing careers, Venus and Serena Williams, the famous tennis players, have both released songs and demonstrated musical talent.
These are just a few examples of American singers who have sisters who are also singers. There are many other talented sibling duos in the music industry.