I have a brother, whom i believe is an innocent man?

He was convicted beginning of last year, his Appointed attorney filed an appeal. I believe his attorney didn't fight like he was suppose to in the case, I want to state that he wouldn't investigate anything. He took all the evidence from the prosecuting attorney and he did not build a case on the evidence he had in hand, what can I do. well he filed the appeal its in appeals court its a rather lengthy process and my brothers kids are getting the brunt of it i think. they need counseling now and i fear there mother whom had a hand in his conviction is unfit. its a tangled web that cost to much money to get fixed, and hes innocent.