Twin-In-Law

When one of the married couple shares the same birth date as the other spouses siblings.

Jon A. (birthday december 13) marrys Anna P. whos sister Kelly P. (birthday december 13).
Jon and Kelly are Twin-In-Laws!!!

by Jkasp November 12, 2009

Twin in law

Someone who marries your Twin sibling ..

Jack: ayo twin in law come help me with this project

by __mybumhole__1 October 17, 2020