If you were dating to find a long term relationship what would you want to know before deciding to be official with a potential partner?

As far as I can tell things are going good and I am comfortable with the idea of a potential future with this woman, and since she's now said "at some point we're going to accidentally skip several levels because my family is at my house all the time", I can say with some level of certainty that she's considering the relationship seriously.

I would however like to make sure we've talked about all of the important things before we go all in. So, if you started dating someone and have already discussed that in about 3-5 years you both want to have children and are looking for something long term, what sort of things would you want to know before becoming "official" with someone?
If you were dating to find a long term relationship what would you want to know before deciding to be official with a potential partner?
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