Disclaimer: Do I really still need a disclaimer? We all know they aren't mine.
1976 - Percy
Compared to Bill and Charlie, Percy was an angel. By the time Christmas came, he was four months old, and was already much better behaved than either of his older brothers. He rarely fussed or clamored for attention, and it was a welcome relief to settle in her rocking chair with the quiet boy after a day of trying to keep her older sons out of trouble.
It was Great-Aunt Muriel who pointed out that the boy's behavior wasn't at all Weasley-like. "Has the makings of a politician, that one," she sniffed, watching the way Percy seemed to look down on his brothers for rolling around on the floor and behaving like 'hooligans' (Muriel's word, not Molly's).
"Auntie Muriel, he can't even talk yet," Molly protested, thinking it was far too early to be pronouncing such judgments.
"He's biding his time. You'll be lucky if he doesn't turn up Slytherin, Molly."
By next Christmas, Percy was walking and talking, months earlier than either of his brothers had managed, almost as if he had something to prove.