sisters-in-law (noun) relative: member of a family
Sinonime: agnate, aunt,
blood, brother-in-law, clansperson, cognate,
connection, cousin,
father, father-in-law, folk, folks, grandparents, great-grandparents, in-laws, kinsperson,
mother, mother-in-law, nephew, niece,
relation, sib,
sibling, sister-in-law, stepbrother, stepparent, stepsister, uncle