Sentence:  The three sorts of tensions discussed here, then, generally elicit open resistance only when one family grouping is thought to be favored or disfavored over others. In such cases, the spokesperson for the <WSD>family grouping</WSD> generally approaches the foreman with the family's grievance. 
Meaning of the word marked with <WSD> tags:  A group of individuals who are related by blood and/or by marriage.