Are you kidding? You'd sell an entire house in the worst market in ages - merely to pay an overdue tax bill?
You need to talk to a Real Estate ATTORNEY right now - one who specializes in foreclosures. The lawyer can delay things very well, and you'll have options. What you should NOT be doing is talking to an agent about selling it.
Those taxes can't amount to all that much. Don't lose an entire house over some stupid unpaid taxes - do whatever you have to do - get a 2nd job, etc. Band the whole family together on this.
Get this done fast - before someone like me (but much meaner) comes along, buys your tax lien - and then gets to "buy your entire house" for a mere $5-10K.