Yes, since you filed Head of Household, you are considered two separate tax families. For the purpose of the PTC, you will keep it separate and do not include the whole family on form 8962.
The PTC is a tax credit for certain people who enroll, or whose family member enrolls, in a qualified health plan. The credit provides financial assistance to pay the premiums for the qualified health plan offered through a Marketplace by reducing the amount of tax you owe, giving you a refund, or increasing your refund amount. You must file Form 8962 to compute and take the PTC on your tax return.
Here is a link to the instructions for Form 8962.
