When you are entering your 1095-A, there is a box to mark to indicate you shared the policy with people not on your tax return. You can divide it up however you all agree as long as the amounts total up to 100%. If someone on your 1095-A is not your dependent or your spouse and does not file taxes, you'll have to repay any discount you got to help pay for health insurance.
After you enter the amounts, you will get the following screen where you can indicate you share the policy.
Shared Policy Situations