-iyum NA DEP sister-in-law (originally, ‘cross-sibling-in-law’) ● niyum my sister-in-law niyumak my sister-in-laws niyumuk on my sister-in-law wiyumah his/her sister-in-law kiyumunônash your and my sister-in-law Niyum yo tá wáhsukah This is my sister-in-law and her husband.