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Answer to Relatively Speaking

The passengers were the driver and her son, plus her brother and his daughter. The fifth passenger was the driver's father (the family's grandfather).

This makes two fathers, two sons, two daughters, two cousins, a grandfather, his grandson and granddaughter, a mother, brother and sister, uncle, aunt, nephew and niece. If you substituted "a pair of siblings" for "brother and sister" they would still be related in 18 ways.

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