The phrase “foster sisters” usually does not refer to a specific famous duo, but to a family relationship: girls or women who grow up together in the same foster home without being biologically related. In other words, they are sisters through fostering, not through birth or adoption.

What “foster sisters” means

  • A foster sister is a girl or woman who is not the biological child of your parents but is raised in the same household because she has been placed there as a foster child.
  • If your family takes in a foster child and that child is female, she would typically be called your foster sister.
  • Over time, many families and kids drop the word “foster” and simply say “sister” once the bond feels permanent or very close.

How the relationship works

  • Foster sisters may share day‑to‑day life, school, chores, and family events, just like biological or adopted siblings.
  • They can have strong emotional bonds even though they do not share DNA or may not stay in the same home forever, depending on how long the foster placement lasts.

Why you might see “foster sisters” online

  • The term often appears in social media stories, advice threads, or forums where people talk about living with foster siblings or navigating blended families.
  • You may also see it in news or human‑interest pieces about groups of sisters separated or reunited through the foster care system.

TL;DR: “Foster sisters” are sisters through foster care—girls raised together in the same foster family even though they are not biologically related.

Information gathered from public forums or data available on the internet and portrayed here.