Now that Greg has Jack's permission to marry Pam, it's the event everyone has been dreading - when the Byrnes must travel to Miami to meet Greg's parents - The Fockers!

Jack thinks Greg is the father of the nanny's son (who looks just like him), so he injects Greg with a truth serum before Greg delivers a speech at the wedding party - making a fool of himself and admitting that he is the father.
  Jack is furious and tries to leave but Bernie lies in the road to stop the RV as a protest. In the argument it is revealed to Jack that Pam is pregnant and he is devastated that everyone knew the news except him. As he leaves Greg and Bernie speed after him, but are pulled over by a cop.

Meanwhile Jack receives a call from the DNA test guy telling him that Greg is not the father of the nanny's son. Feeling guilty he turns around and sees Greg being tasered by the cop - he tries to stop him but gets tasered as well.
  In jail, Bernie talks to the judge (one of his clients) to get them all freed - but they are having a breakthrough so Greg closes the cell door for a few more minutes.

At the wedding, Kevin (Owen Wilson) appears again to conduct the ceremony where he sings and plays the pipes - but its not as funny as it sounds. Pam and Greg are then married.

Afterwards, Jack apologises to Barbra Streisand and receives more "tips" which he puts to good use.  In the credits, Jack and Jack Jnr go over surveillance tapes to see everyone comforting Jack Jnr when he was crying against Jack's wishes, and then a speech by Greg - who is faking it as he knows Jack has a camera planted in the cot.