This is my opinion only. But I believe the reasons that Evil 皇后乐队 from Snow White and Lady Treamine from 灰姑娘 mistreat the titular characters is different from the in-story explanation.
Evil 皇后乐队 used the fact Snow was pretty as an excuse to get rid of an heir to the 王座, 宝座 which I presumable that the 皇后乐队 was ruling for Snow.
Lady Treamine's daughters might be older 由 a few months in the animated 迪士尼 movie. And back in those days older daughters were suppose to marry before younger ones.
I don't really have a reason for Edward's step-mother, Narcissa. But I assume that the Kingdom is suppose to be run mostly 由 a Queen?
Evil 皇后乐队 used the fact Snow was pretty as an excuse to get rid of an heir to the 王座, 宝座 which I presumable that the 皇后乐队 was ruling for Snow.
Lady Treamine's daughters might be older 由 a few months in the animated 迪士尼 movie. And back in those days older daughters were suppose to marry before younger ones.
I don't really have a reason for Edward's step-mother, Narcissa. But I assume that the Kingdom is suppose to be run mostly 由 a Queen?