You could probably see prices at one of the Obamacare websites. I'm on Obamacare in Massachusetts, and the premiums for me ranged from about $300-600 per month. For a couple, you just multiply by two (couples don't get any discounts over single people). So for a couple, the cost is about $600-$1200 per month.
I never looked at family prices because I don't have kids, but I think the family plans are not that much more than the plans for a couple.