As others have said, you probably qualify for the home sale capital gain exclusion.* For simplicity, just enter the 1099-S, as if you got it all. Enter at Less Common Income / Sale of Home. If it still bothers you to show the full gain, the workaround is to add his half of the gain to the cost basis.**
*You must have lived in the home for at least 2 years out of the 5 years prior to the sale. Even if you don't meet that, the divorce is an exception. Reply back for details, if that is your case.
**Technically the way to do it is show an adjustment and code in columns (f) and (g) of form 8949 for the "nominee" adjustment. But, TurboTax can't handle that.
