I don't think Family Guy ever came out in books unless you mean comics?
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The retarded rooster is seen in episode 2 of season 8 of Family Guy which is entitled "Family Goy."
because he's a baby
No such character exists on Family Guy
The next Family Guy episode will be season 8, episode 4 "Brian's Got a Brand New Bag". It will come out on November 8, 2009. Its when he dates an old lady and he is the laughing stock of the family.
There is no mailman character on Family Guy