Which leads me to another thought, if the prince fell in love with her because of a magical casting, is it really love? Perhaps that is another reason he asked for the child. He knows the child is born out of a lie and he doesn’t think Cinderella deserves to be a mother. Just a thought…
Both Rumpel and the Genie (Sidney) have both said that magic can do much, but not create love. Furthermore, Prince Thomas himself said that magic didn’t create the love between him and Cinderella. Thus, their love is real and the child a child born out of its parents love. Much like Emma, actually.