Board Thread:Show-Related Questions and Answers/@comment-24386552-20141222010730/@comment-24936039-20150204032831

I believed that Regina had very little respect for her father since he did not help (whether he could do anything about the situation or not doesn't matter, especially from a child's/teen's perspective) moderate Cora's controlling behavior towards Regina growing up. So yeah, it made a lot of sense that she had a love-hate relationship with Henry senior. Once Cora was removed (pushed through the looking glass), I think the relationship between Regina and her father improved to the point that he became Regina's most loved person, but still not well respected (actually, I don't think Regina much respected anyone except for Rumples and perhaps Maleficent), thus she was still able to go through and cast the first dark curse using her father's heart.