Normally, a parent who is actually on the hook for the premiums and the premium tax credit, takes 100% of the allocation, unless one of the children is employed and has money of their own.
You don't find the allocation; instead, you choose it in agreement with the other people on the 1095-A. Of course, if the other people are minors, it makes perfect sense that you take 100% and they take 0%.
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