sestra
Means "sister" in several languages such as Ukrainian. Used by Ukrainian Helena from TV show "Orphan Black" to describe the other female clones.
"Do not treaten my sestra's bebes.
Sestra
Adopted from Orphan Black, originally from Slovac language family, however we have twisted the meaning to mean sister from an extended family, such as a close sister-in-law or step sister.
This is my sestra Cara.