Synonyms of in-laws

1 Syllable
aunt, folk, blood, sib, folks
2 Syllables
kinsmen, nephew, sibling, kinsman, mother, niece, father, cousin, uncle
3 Syllables
cognate, menage, grandparents, kinsperson, family, agnate, stepbrother, connection, stepparent, clansperson, relation, grandparent, kinswoman, stepsister
4 Syllables
brother-in-law, father-in-law, mother-in-law, sister-in-law, great-grandparents