Has gpa george been dna tested?

Maby thats why lee was upset,he was cleared of being the father...im jus wondering if maby it was about to be discovered who the real father might be...could be a coverup crime who knows with all thats happening how this coud play out.they are a very troubled family and i do sympathize with them for having their whole life on display and such and if gpa has a hand in it i do hope it comes out in the open and he takes his share of the blame.