Deductions & credits

You said your father bought it in 2012 for $64,700.  That is the basis of the house.  Then you add expenses to it, like the closing costs when your father bought the property, to arrive at the adjusted basis.  If you don't have the settlement sheet from his purchase, you can "guesstimate" at 3% of the cost.  You also said there were no improvements made to the house--normally these would be added to the basis as well.

So that gives an adjusted basis of $66,700--$64,700 + 2,000 for closing costs.  You will enter the closing costs for selling the property when you enter the transaction in TurboTax.

A sale of a second home is considered a sale of an investment.  To report this in TurboTax, please follow these steps:

TurboTax Online

1. Click on Federal > Wages & Income
2. In the Investment Income section click on the Start/Revisit box next to Stocks, Mutual Funds, Bonds, Other.  If you have already entered some investment sales, you will see a screen Here's the investment sales info we have so far.  Click on the Add More Sales link. 
3. If you haven't yet entered some investment sales, you will see a screen Did you sell any investments in 20XX?  Click the Yes box.
4. On the screen,  OK, what type of investments did you sell? mark the Other box and click Continue.
5. When you get to the screen, Now we’ll walk you through entering your sale details enter the details of the sale.  You will be able to select the type of investment in the first box [second home, land, etc.]  [See Screenshot #1 below.]
6. Enter the requested information and click Continue when done.

TurboTax CD/Download

1. On the Wages & Income screen, in the Investment Income section click on the Start/Revisit box next to Stocks, Mutual Funds, Bonds, Other.  If you have already entered some investment sales, you will see a screen Here's the investment sales info we have so far.  Click on the Add More Sales link. 
2. If you haven't yet entered some investment sales, you will see a screen Did you sell any investments in 20XX?  Click the Yes box.
3. On the screen,  Did you get a 1099-B or brokerage statement... click the No box.
4. On the screen, Tell us about this sale, mark the radio button, I'll enter one sale at a time.
5. Enter the information in the boxes that appear.  You will have to type in Inherited Home in box 1a.  For date of acquisition, you can either enter a date or "inherited."  [Screenshot #2]
6. Enter the total sales proceeds as well as the other information requested.  
7. Continue to the screen, Select any less common adjustments that apply.  
8. Mark the first box The reported sales price did not deduct all fees or selling expenses.  [Screenshot #3]  
9. Enter the sales expenses not deducted from the sales price entered earlier.

Screenshot #1

Screenshot #2

Screenshot #3