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.
Family Guy :)