Sentence:  The other families group themselves differently: empty nests, single parents, working mothers, spinsters with cats, curmudgeons with canes, the <WSD>Brady bunches</WSD>, reconstituted households of halves, steps, formers, and presents. 
Meaning of the word marked with <WSD> tags:  Children in a family who are from previous partnerships of the parents; a family that includes children from previous partnerships of the parents.