There are a few things you already know about marriage. If you get married, you might be able to share the same last name, you'll avoid paying child support for a child you and your wife or husband had when you weren't married, and you gain some tax benefits, too. There are some other benefits to marriage you may not have considered, though, that your attorney can walk you through.
For instance, if you're married and a spouse passes away, then the spouse's IRA can be roll over to the other spouse's IRA, boosting that person's potential retirement income. If you aren't married, then you will have to start taking the distributions right away, which may not be to your benefit in the long term. On the topic of an IRA, you can also contribute to a spouse's IRA if you are married.