TurboTax 2015 can handle your situation just fine when filing a joint federal return. Basically, the program will ask each of you individually for your "primary state", and also ask each of you individually if you earned money in a state outside of your primary state. Then from there so long as you read the screens, the whole screen, and pay attention to the small print, you shouldn't have a problem. The important thing for you though, is that when entering your income (such as W-2's) you will be asked something along the lines of what state that income was earned in. I could go on and on with detail, but it's a waste of your time for me to tell you what the program will ask you for. You'll see as you work it through.
But do be aware that for the 2015 tax return you can not e-file it. Neither federal or state taxes. You'll have to print, sign and mail each tax return separately to the appropriate taxing authority.
If you post back here with more questions or needing more information, then in each post I suggest you make it clear that you are completing a 2015 tax return. Otherwise, someone not reading the whole thread will assume you are working on your 2018 tax return.
