Prayer

How does one pray properly when you are afraid of God's will. What if it is God's will that your grandchld be mentally disabled? I want to pray that he will be healthy and intelligent and sound, I know I should I be praying that we, as his family have the strength to care for him and love him. I know that I have some of that strength, I already love him, and I do pray that for myself and his parents and his older brother, but I want him to be whole. I know he will be 'whole' in his own way and he will be a blessing no matter what, but even so I want him whole, that selfish I have the smartest most beautiful grandson in the world kind of whole.