Talk:Princess Cadance/@comment-32657625-20180926201434/@comment-7345250-20180926202824

Cadance is supposedly niece to them both, so I imagine Princess Celestia just found a distant relation (a la Prince Blueblood) who was willing to be her guardian.

Princess Luna was imprisoned in the moon when Cadance was young, so it is clear that she had no say in the adoption.