Puzzle 63 - Who's who?

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 Normally the logic puzzles will be too convoluted to even understand. But this one is not.

  1.  In a certain bank the position of cashier, manager and teller are held by Brown, Jones and Smith, though not necessarily respectively.
  2. The teller, who was an only child, earns the least.
  3. Smith who married with Brown’s sister, earns more than the manager
Can you find out which post is held by who?

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