I actually had the same thought. But i figured its probably not so. It’s been a year since Daniel, who could the father have even been? As to why Snow didn’t experience pain but regina did? Regina is a magic user and King George is not. Regina probably made the potion herself and it was probably more powerful and more painful. And plus it was probably pure while King George may have simply pour a little vial of the potion into, like, wine or something for Snow White so she didn’t notice.
"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC