First off I think you have Baby Bowser and Bowser Jr. confused. Baby Bowser is just Bowser as a baby. Bowser is not Baby Bowser's father, he IS bowser. I don't remember what games in particular, but I remember seeing baby mario, baby bowser, and baby peach together...so I don't really see how peach could be the mother.
And for the quote I dunno cause I never played that one, but I'd assume it's kinda like how a bird thinks the first thing it sees is its mother.
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