姻戚[inseki] relative by marriage
姻族[inzoku] in-law
婚姻[konin] marriage
婚姻届[konintodoke] marriage registration
婚姻法[koninhou] marriage laws

婚姻届け書[konintodokesho] marriage registration
婚姻手続き[konintetsuzuki] marriage procedures
婚姻要件具備証明書[koninyoukengubishoumeisho] certificate of legal capacity to contract marriage
婚姻色[koninshoku] nuptial coloration (colouration)
婚姻挙行者[koninkyokousha] marriage solemnizer