Crossword clues for the word: SISTERINLAW The word SISTERINLAW has appeared as an answer to at least 6 crossword clues on different crossword puzzles. Crossword clues for SISTERINLAW Showing 1 to 6 of 6 results Clue(s) "*Pippa Middleton, to Prince William" "Hera, to Persephone" Nun for the defense? Relative by marriage Relative or nun legally? Relative, but not by blood