Affinal Relationshipdcv on November 26, 2017November 28, 2017 This picture is showing my sister’s fiancé FaceTiming my sister while she was at work in Mexico. She was unable to make it to our traditional family dinner so we still included her over the phone. Guest states that an affinal relationship is “a kinship relationship stablished through marriage and/or alliance, not through biology or common descent” (246). Kenneth J. Guest. 2016. Cultural Anthology. W.W. Norton & Company, Inc. My sister’s fiancé, I learned, is now my brother through affinal ties.