I thought he was amazing. Despite his age, he regularly spoke the most sense out of any of them. I guess he's never lived through the hero worship of Gazza in the present tense, and nor can he ever remember a great dad.
As a result he seemed far more realistic than any of them, and was totally ready to move on without his dad. Gazza to him is as insignificant to him as the biological father(s) of the other two are to them. All he's seen is trouble and misery, so why would he want them all to work so hard to get him back into their lives.