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When one member of your family marries, they are related to their partner’s family as a result of the wedding. This relationship is said to be ‘in law’ due to the legally binding nature of the union. Thus the mother of the bride is the ‘mother-in-law’ of the groom, just as the father of the groom is the ‘father-in-law’ of the bride. If either the bride or the groom has siblings, then they become the sister- or brother-in-law of the other party.