You will get the best benefit by filing as Married Filing Jointly.
Assuming that his child meets the requirements to be claimed as a dependent, you should also claim the child as a dependent on the joint tax return.
Here is a link to a resource containing the rules for claiming a dependent on your tax return:
Rules for Claiming a Dependent on Your Tax Return - TurboTax Tax Tips & Videos (intuit.com)
If the child does not meet any of the requirements to be claimed as a dependent, then you should file as Married Filing Jointly and not claim the child.
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