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Archie's dad might disapprove of some of his actions, but surely you can't have the Un-Favourite without a Favourite? Archie appears to be an only child, and only learns otherwise after his father's death, while Hector never learns he has another son at all.
Also, it's an Zero-Context Example. A mere character name is not enough context.
I'm not sure how Ron's getting everything he wanted correlates with being the Unfavorite. Even successful people can be the Unfavorite.
He's not The Unfavorite at all. At best, you could claim that he's afraid that he is, but really that's more being afraid of not living up to his siblings' accomplishments in general, with him never citing his parents in this (it seems to be more I Just Want To Be Popular rather than Parental Favoritism).
... honestly, the entire Harry Potter section is a mess.
I personally like the old Phineas And Ferb picture better than the Fox Trot one (for reference, it's right here◊.)
And you should. The current picture has nothing at all to do with the trope. They're laughing because they're unsympathetic, not because he's the unfavorite.
I cut this because it's just not true:
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