My ex provides my son with marketplace healthcare. I am claiming him as dependent. How do I enter son's 1095A if his dads form has family total not ind. total for my son?

My ex gave me a copy of his 1095A.  It has his family of 5 on it.  The totals in columns A, B and C are for the whole family.  How to I figure out the amounts to enter for myself son alone on my tax return?  Do I divide by 5 to get my son's portion?

I appreciate any help, I'm so confused!