YOU SAID:

my stepsister is annoying

INTO JAPANESE

私の義姉は迷惑です

BACK INTO ENGLISH

My sister-in-law is annoying

INTO JAPANESE

義妹はうるさい

BACK INTO ENGLISH

My sister-in-law is noisy

INTO JAPANESE

義姉はうるさい

BACK INTO ENGLISH

My sister-in-law is noisy