Southwest's companion pass allows you to take one other person along with you for free on every flight. You have to earn 110,000 qualifying points in the Southwest program within a year to get it. There are four different 50,000 point credit card offers out right now and you have two adults in your household capable of applying for credit cards.

But this would take some significant effort and you'll need to learn a lot more about how the Southwest program works. If you're still interested, start by reading the info on their website and also:

Southwest Rapid Rewards FAQ (somewhat up-to-date)
http://www.flyertalk.com/forum/south...ts-offers.html