Yes, you need to do the Shared Allocation to calculate the Premium Tax Credit (PTC). Indicate in the 1095-A section that you 'shared the policy with someone not on your return'.
When TurboTax asks for your % Allocation, you can try a couple different configurations to see what works best for you (gives you a larger PTC), since you are the one paying the entire premium.
If there are 3 persons on the policy, for example, you can allocate 33% to the person not on your return. Or, you can figure that 80% of the policy cost is for you, 10% for your daughter, and 10% for your son. Any way you want to allocate the premium cost between the persons on the policy is fine, as long as the total doesn't exceed 100%.
You could allocate 100% of the premium cost to your son, but since he does not file his own tax return, this may not help your ex-spouse, unless he receives his own 1095-A. In that case your ex-spouse could claim a premium allocation of 100% for him, as long as you agree.
Click the link for more info on Shared 1095-A Allocations.
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