Hi RedRoss!
Sounds like you have a shared policy. It is okay if your ex-wife claims your child and you carry the insurance. Whoever claims your child will indicate that he had health insurance all year. There is nothing further that needs to be done.
If your child is required to file a tax return, then the Form 1095-A will need to be allocated between the two of you. You can read more about allocating a shared policy here.
If your son is not required to file, then you will report Form 1095-A on your return without allocation.
Hope this helps.
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