1
sister-in-law (spouse's older sister or older brother's wife)
兄が急逝したのは２年前、義姉は一人兄の遺した小さな宝飾店を健気に守ってきた。
Since my brother died suddenly two years ago, my sister-in-law has valiantly kept going the small jewellery store he left her.
2
older stepsister;older adopted sister;non-blood-related older sister