It seems quite possible even though Jackie gotr a point.....at least the dog seems top be pretty sure
Evidence one:
*Stewi with Lois' make up on*
Brian: Wow the evidence is really piling up
Stewie Make any joke you want, you know I look good
Evidence Two:
Brian: I bet money, you'll marry a honey, who's pretty and funny, and her name will be Ted.
Stewie: Oh a gay joke.
Brian: I just work with what you give me
Evidence Three:
Brian *about Stewie*: I'm a pompus little Anti-Christ who will probably abandon my plans for world domination so I can be with a rough trick named Jim"