Kinswoman (noun)

A woman who is related to another person by blood or marriage.

Origin:

From the old english word cinswif, meaning a female relative.

Examples:

1. She is my kinswoman, my cousin on my mother's side.
2. He was worried about the welfare of his kinswoman, who was living alone.
3. The queen's kinswoman was appointed as her lady-in-waiting.
4. She was proud to be a kinswoman of the famous author.
5. His kinswoman was the only family he had left.