Brian Griffin is typically portrayed as being around 7 years old at the start of Family Guy, which translates to roughly 40s-50s in human years (mid-40s to 50s), though his age is inconsistent, sometimes cited as 8, and he's generally seen as a middle-aged, sophisticated but sometimes self-absorbed adult in the show's universe, despite being a dog.
Stewie Griffin is portrayed as a one-year-old prodigy who has a sophisticated voice, American football-shaped head, and can speak very fluently in an upper-class British accent with quite-advanced vocabulary.
Peter's age has never been officially confirmed and has fluctuated throughout the series, although he is consistently referred to as being in his early-to-mid 40s.
He lives on the same street as Peter Griffin and Joe Swanson, making them his besties. He is also best friends with the two. He works as a pilot. He was born in 1948, but looks younger because he eats a lot of carrots.
Several episodes have suggested that Lois is bisexual or, at least, bi-curious. In an interview, Borstein stated that Lois became "a little more snarky and sassy and sexual" since the first season, to challenge "those sitcom rules that a woman is supposed to be a total wet blanket and not like sex and is no fun".
The diagnosis for Stewie Griffin that fits appropriately is Oppositional Defiant Disorder (313.81). Stewie Griffin undoubtedly shows more than four symptoms of Oppositional Defiant Disorder, as described in the section “Description of the Problem.”
Grant Gustin, the speedster we know and love from The Flash, got hit with a surprising—and hilarious—curveball from Family Guy. During an episode, Stewie Griffin, the most unpredictable toddler on TV, casually confessed his crush on Gustin.
Meg is the eldest child and only daughter of Peter and Lois Griffin and the sister of Chris and Stewie. A social outcast, Meg is typically depicted as being mistreated and neglected by her family, though this has been downplayed in later seasons.
In November 2013, Family Guy writer Steve Callaghan told E! about why they decided to kill off Brian in the episode, saying: "Well, this was an idea that got pitched in the writer's room and it caught fire, and we thought it could be a fun way to shake things up.
It wasn't until after college that Meg was formally diagnosed with borderline personality disorder and began dialectical behavior therapy (DBT), a specialized therapy that helps patients identify and regulate triggers of their anxiety.
The episode follows Meg as she attempts to look after her handicapped neighbor, Joe, after his wife, Bonnie, has to leave town temporarily to visit her ailing father. Meg soon becomes infatuated with Joe, however, causing him to become nervous, and approach Meg's parents.
Peter tries to convince Lois that they belong together but she stubbornly informs Peter that he had his chance and blew it, and therefore she loves Quagmire now.
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Because there is no single standardized test that measures intelligence, determining the highest IQ ever will always be contentious. Bearing these caveats in mind, it is generally believed that the highest IQ score ever recorded is that of William James Sidis, who is believed to have had an IQ of between 250 and 300.
The episode "Tiegs for Two" revealed that the surname Quagmire was originally the Polish surname Quagglechek or Quaggleczyk, the suffix -czyk indicating a diminutive in the Polish language.
Quagmire's habit of unprotected sex may explain why he has multiple sexually-transmitted diseases, which he notes in "Halloween on Spooner Street". However, during a marathon sex encounter with a woman from the dating site Tinder in "The Dating Game", Quagmire starts out using condoms but abandons them after a time.
It is unknown if they are alive or not, but in The End it is mentioned that the Quagmires are "in circumstances just as dark [...] as the Baudelaires'." Kit also mentions that the last she heard of them was one of the Quagmires calling out Violet's name. Sunny asks which sibling called it, but Kit didn't know.