- Her father was born in Czechoslovakia, the son of Jewish survivors of the Holocaust. Her mother converted to Judaism.
- Her older brother Jake was the lead singer of the band Bluejuice and her sister Elana is a jazz singer and pianist.
- Yael is Hebrew, meaning ''God's strength''.
- In a relationship with Jack Manning Bancroft since 2017. They have a daughter together, Pemau Stone Bancroft (b. May 30 2018).
- She chose not to have a Bat Mitzvah ceremony when she turned thirteen.
- Her mother is a nurse and her father is an architect.
- The youngest of three children.
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