sister; female sibling
This sign originally came from the compound GIRL+SAME (assimilation).
Gloss: MY SISTER IX1 POSS1 BOSS IX2 TWO-THEY(loc) GOOD+ALONG.
English equivalent: My sister and her boss get along well.
The sign TWO-THEY must be spatially agreed with the referents (sister and her boss).
Note: there is no right gloss for ALONG so it's ALONG (disregard this English word for the ASL meaning/concept).