Yes, enter the same % for all three questions, for either you or your son (depending on which gives the better tax outcome).
Or, enter 0% for all questions for you and your son enters 100%, or each of you 50%. You may need to play with the numbers for the best outcome, and yes the totals need to be 100% between you.
If you son has the lower income and the premiums were based on his income, it may work out best to allocate 100% to him. You can see the calculations for the Premium Tax Credit on Form 8962.
Here's more info on Allocating 1095-A.
@sunshinejoe
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