Ooohh, some guys here will have a field day! Your brother did not do you any good by not factoring in depreciation - as a lurker you will most likely have read about "depreciation recapture" at the time of a sale. Irrespective of whether you claimed it over the years or not.
For the past I can't, unfortunately, tell you how to fix this and if it's even possible past the 3-year period during which you can amend your returns (which you probably should do together with a CPA)
But what I would recommend is to file for an extension with the IRS so you have more time to have a CPA look into your situation rather than rush into a (mostlikely incorrect) filing. Not surprised that you can't get anything at this point in time, though - it's tax season. But maybe some of the tax guys here can actually help you on short notice, who knows.
Bear in mind that if you do get an extension to file you would still be required to pay any taxes that you owe by 18 April 2017. If you do not, you will be subject to penalties after that date. Then again, this only applies if you owe something and is also not the end of the world with respect to the amount of the penalty should you indeed owe something - which, at this point, you don't even know. But with your (combined) income, factoring in deprectiation, in all good reality you won't owe anything in addition to what was already withheld by your employers.
Obviously, the above is by no means tax advice nor intended to be tax advice. Just a fellow investor who paid the IRS here or there a bit more than he normally would have to LOL