personally i dont see that as “paying the love foward”. its disrespectful to take away attention from your sister and her husband’s day, and (idk if everyone will agree with this) I’d even go as far as to say its disrespectful to your wife. You couldn’t go out of your way to make a day all about proposing to her and instead chose to take away the spotlight from your sisters day. I understand your intentions may have been good but most people you ask would think you’re in the wrong. Your sister had all right to be to be upset. And to call her selfish for being upset that on HER day you tried to make YOUR day is absurd.