Robert Underdunk Terwilliger Sr.
Gender
Hair	Gray
Age	78, born : 12th October 1929
Occupation	Doctor
Relatives	Sons: Robert Terwilliger and Cecil Terwilliger Wife:Dame Judith Underdunk Grandson: Gino Terwilliger Daughter In Law: Francesca Terwilliger
First Appearance	"Funeral for a Fiend"
Voiced By	John Mahoney

Robert Terwilliger Sr. is Sideshow Bob's father.

When Sideshow Bob was put on trial for trying to kill The Simpsons, he claimed that Bob had suffered from an illness caused by his desire to kill Bart Simpson. Bart threw Sideshow Bob's medication out of a window (believing it to be a biological weapon). This subsequently caused Sideshow Bob to "die". In reality, Bob was injected with a death simulation drug by his father prior to the fated trial in order to conduct a complex plan to kill Bart Simpson via locking him in a coffin and cremating him. He, and the rest of the Terwilliger family, are in prison.

Behind the Laughter Edit

Robert Terwilliger Sr. was voiced by John Mahoney, who also plays the father of the two brothers in Frasier. The two brothers are voiced by Kelsey Grammer and David Hyde Pierce the voice actors of Sideshow Bob and Cecil Terwilliger who are brothers in The Simpsons. Kelsey and David also star as Frasier and Niles Crane.

Trivia Edit

• He has many similarities with the Mayo Clinic Doctor they both have similar faces and similar hair.
• Where Sidshow Bob gets his overall appearance from his Mother, appears to have a similar body structure as his father.

Appearances Edit

• Episode – "Funeral for a Fiend"

Terwilliger Family
Robert Terwilliger Sr. | Dame Judith Underdunk | Sideshow Bob | Cecil Terwilliger | Francesca Terwilliger | Gino Terwilliger

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