Bride and groom with their new in-laws.
in-law definition by Webster's New World
Informal a relative by marriage
Origin: ; from mother- (or father-, and the like ) in-law
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
being a (specified type of relative) by marriage, not by descent in the same family line
in-law definition by American Heritage Dictionary
A relative by marriage.
Origin: Back-formation from such compounds as mother-in-law.