Adrian Peterson's late two-year-old son was definitely his.

A couple of months ago, Adrian learned that he might be the father of the boy, who was living in South Dakota. He immediately offered to step up, but he did take a DNA test just to be sure -- and it came back positive. 

Adrian was planning to be a part of the child's life, and he offered to help out financially. Unfortunately, he only met the boy once, just hours before the tot died following that beating at the hands of the boyfriend of the mother.

Adrian also plans to attend the funeral.