In an urban setting, your chances are low. Over all, getting overwhelmed is a distinct possibility. If that were to happen, rest assured, many of us would prove 'game to the bone' as the old dogmen used to say. It would seem like a waste but given enough prior notice you could wire the place to go boom if you lose.
Would you rather punch out with your better half or leave her to be captured by the pieces of human waste?
These type hit easy targets first. Consider the biological option.
Easy to find caches of tainted food strategically placed well outside of your secure area could possibly thin that 29 thugs down enough to increase your family's' chances of survival.