In Urdu (my native language) there are specific names which distinguish each familial relation, however in English I believe it would be sister-in-law. I could be mistaken, (you know us ferners ;)
@MrItty Lurve for saying “pardon me” haha that cracked me up for some reason. As if to excuse you while you do a quick search and everyone’s anxiously awaiting a well crafted response.
@Bagardbilla Which is helpful, say, at a family gathering where there are teams playing soccer, and you have forgotten their names, but can at least call them by their designated title in Urdu.