[Aliantha]

Dazza and I were engaged after only about 6 months being together and married 6 months later.

I knew we'd be together long term the first time we met. So did he.

Sometimes that's just the way it happens. I wouldn't have listened if someone tried to warn me off or suggest I was doing the wrong thing because I knew it was the right thing for me at the time. Most likely your sis feels the same way MTP, rightly or wrongly.

If she did listen to you though, what would you really want her to do? Just prolong the engagement? Just note that you have concerns?

In my experience, I told you so's are pointless when relationships break up, so just try and put things in such a way that she doesn't feel like you're setting the scene for that sort of conversation in the future. That's about the best advice I have other than what's already been said.