If you were married on 12/31/2019, you can't file as Single.
You can file as Married Filing Jointly and claim your wife and children, since you supported them, even though they did not live with you all year.
You may qualify for the Child Tax Credit for your children, but not the Earned Income Credit, as you were not the Custodial Parent.
You can only file tax year 2019 right now as an Efile.
To file for tax year 2018, you would need to purchase and download TurboTax, then prepare and mail a 2018 tax return.
Click this link for detailed info on Rules for Claiming a Dependent.
Click this link for info on How to Prepare a Prior Year Return .
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