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.
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Birdo
fo the last time birdo is not a boy she is girl
She is 2 years younger than Yoshi.
Yes, because in certain games you can see pink Yoshi eggs...question solved.
Birdo is Yoshis girlfriend, and they are in multiple games together.