PROBLEM:
Bill, Ken, and Mark are, not necessarily in this order, a quarterback, a receiver, and a kicker.  The kicker, who is the shortest of the three, is a bachelor.  Bill, who is Ken's father-in-law, is taller than the receiver.

Who plays in which position?
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SOLUTION: 
Since Bill is Ken's father-in-law, both Bill and Ken must be married.  This leaves the only remaining person, Mark, to be the bachelor (and hence the kicker).  Since Bill is taller than the receiver, Bill must not be the receiver.  By process of elimination, we conclude that Bill is the quarterback.  The remaining position (the receiver) goes to Ken.

Therefore, Bill is the quarterback, Ken is the receiver, and Mark is the kicker.