Thaddeus Griffin
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| Full Name: | Thaddeus Griffin |
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| Voiced by: | Seth MacFarlane |
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| Episodes: FG502 "Mother Tucker" | |
Thaddeus Griffin is Peter's evil twin brother. He shows up when Peter's mother leaves her husband, declaring this new event will surely affect his inheritance. In the episode Padre de Familia, it is shown in a flashack that Peter was born alone, with Thaddeus nowhere to be seen, even though it is possible that he was born one hour or so later. He only appears in the episode Mother Tucker. He may be Peters half brother (via Francis Griffin)
