Family Tree


A family gathering consists of father, mother, son, daughter,
brother, sister, cousin, nephew, niece, uncle and aunt.  But
there are only two men and two women present.  They have a 
common ancestor, and there has been no consanguine marriage. 
Explain how this is possible. 
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Answer:
A brother is present, without his wife but with his son, and
his sister without her husband but with her daughter.