You are
in a community speaking an Iroquois, Omaha, or Crow language, probably in USA or Canada. These language use the same word for "sister" as for (some instances of) "female cousin".
You are
in a community speaking an Iroquois, Omaha, or Crow language, probably in USA or Canada. These language use the same word for "sister" as for (some instances of) "female cousin".