The sibling of one's spouse. / The spouse of one's sibling. / The spouse of the sibling of one's spouse. / The sibling of the spouse of one's sibling.

Alternative form of sibling-in-law

plural of sibling-in-law

plural of sibling in law

(rare) One's spouse's sibling's spouse; either of two (or more) people who marry siblings, from the perspective of the other.

The half sibling of one's spouse. / The spouse of one's half sibling. / The spouse of the half sibling of one's spouse.

plural of co-sibling-in-law

plural of half-sibling-in-law