1095-a

Hi guys, how do I find the percent of the SLCSP that applies to me AND the percent of any advance payment of the Premium Tax Credit that applies to me knowing that I'm adding the same form 1095-a my parents added to their return since I am covered in their policy along with my sister, my mom and dad. (NOT the percent of the premium that I paid, they paid 100% so my percent is 0) Thanks!!