Peter's Two Dads
This never happens in an episode of Family Guy.
If you mean "go to" as in attend classes, there is no such episode, but if you mean visit, Peter, Joe & Glenn visit Harvard in The Giggity Wife
Blind Ambition
he goes back to the third grade. the episode is tales of third grade nothing
In the US Season 5 (UK Season 6) episode 'Barely Legal', Brian accompanies Meg to the prom because she had nobody else to go with. This was also the episode with the first 'Cool Whip'!
Peter Brian Hemingway goes by Pete.
In the Episode 15 of Season 4 "Brian Goes Back to College", Peter and his friends find Brian, who is writing a report for the local newspaper. When Peter and his friends win the costume contest, Brian writes a report about it, and is later telephoned by a member of The New Yorker, who tell him they would like him to work for their magazine. Brian is initially given a warm welcome by the staff, but he is immediately fired after he informs them he never graduated from college.
Saving Private Brian.
This never happens in an episode of Family Guy.
Season Three|Episode Eleven Emission Impossible
If you mean "go to" as in attend classes, there is no such episode, but if you mean visit, Peter, Joe & Glenn visit Harvard in The Giggity Wife
Blind Ambition
Season 9|Episode 17 Road to the North Pole
that is episode 46 (well that is what i was told so go and check that out)
he goes back to the third grade. the episode is tales of third grade nothing
"He" ... exactly who is the "He" you speak of ?Brian, Stewie & Mort go into the past in Road to Germany.Peter & Brian go into the past in Meet the Quagmires.Stewie, Brian & Bertram go into the past in The Big Bang Theory.Stewie & Brian go into the past in Back to the Pilot.Stewie travels into the past (& future) in The Untold Story.
There is many places to go for information on Brian Wilson. You can go to your local library, his website, wikipedia, or imdb. You can also read the book titled "Catch a Wave: The Rise, Fall, and Redemption of the Beach Boys' Brian Wilson" by Peter Ames Carlin.