Solved
We are each claiming one child as a dependent. He stayed in the marital home, I am now living separate effective June 2016.
You can claim Head of Household if the spouse didn't live in your home for the last 6 months of the year. It has to be 6 months, no less. You must also have paid more than half the cost of keeping up a home for the year and the child must have lived with your for more than half of 2016 as well.
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