My sister-in-law (my late-husband's sister, not my brother's wife)
You know, in my mother tongue, Urdu, there are two seperate words for the two relationships. So we don't need to clarify which one we are referring to. Languages have a lot to do with our cultures, traditions and mindset.
It's nice to know that you had a joyful ride seeking the Mother Moon. A sight of nature feels like a bliss.
Have a nice day, sister.