What is George's attitude about Steve? And what is Keller's attitude about Steve?

Initially George had cut off all contact with Steve thinking that Steven was to blame for the faulty airplane parts. When the play opens George has just visited his father (Steven) for the first time. George has become convinced of his father's innocence and Joe Keller's guilt. Joe Keller feels some guilt over sending Steven to prison but justifies it by saying he did it all for the family.