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While three Americans set free in a prisoner swap with Iran are being checked out in Germany, the family of an American still missing in Iran is not happy he's been left behind.

FOX's Rachel Sutherland reports from Washington:

Former-FBI agent Robert Levinson wasn't on the plane with the other Americans released from Iran. No one seems to know where he is. He vanished in Iran in 2007 while on an unauthorized mission for the CIA. Levinson's family hopes the U.S. government doesn't give up on him. His son saying:

(Dan Levinson) "The fact that the U.S. government has pledged to cooperate with them in locating him is nonsense to us... because they need to do more than that. They need to demand Iran release him and return him home to us."

An Iranian-American businessman is also still trapped in Iran.

In Washington, Rachel Sutherland, FOX News.