The Super Mario Bros 2 guide says :
Birdo thinks he is a girl. He likes to wear bows and have make up. If this helps your decision!
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From Mario? Well, it says in Super Mario Bros. 2 that he's a boy, but thinks he's a girl. Although, in later games Birdo is described as a girl. It hasn't been all boy, or all girl. It might be a different Birdo with a different gender, or it might be able to change genders. But yes, Birdo definitely was a boy in Super Mario Bros. 2. Maybe someone tricked it into thinking he was a girl.
No, they could be brother and brother. Becasue Birdo IS a cross-dressing male. It even says so in the Super Mario Bros. 2 instructional manual.
Jump on top of the an egg, press (B) to grab it, run up to birdo and press (B) again to throw it back.
you can get the drift board by defeated birdo