Is it okay if I ruin my sister's wedding dress?
Why would you want to ruin her wedding dress?
I never liked her and I always thought she is a bitch.
Not getting along with your siblings happens sometimes so it's understandable but ruining her wedding dress is just mean and rude. You' shouldn't go out of your way to do things like that and instead just distance yourself from the person.
Whatever. Let's just ignore her and ruin her wedding.
You're not hearing me. You wouldn't want your wedding to be ruined by your sister, so you should think about not ruining hers. Don't you want to celebrate your sister's happiness and congratulate her on her marriage?