As mentioned above being a caregiver can be tough but you can do it and your wife will need you for strength and keeping her positive in this fight...your love for each other will grow so strong going through this.
My wife stayed by my side while I went through chemo treatments at the Mayo Clinic last fall and winter and it was the first time in my life where I knew someone had my back! She owns a small party store and her business suffered but she stayed by my side the whole time.
Our prayers will be with your wife and you and your son. You guys can beat this!