A god parent is some one responsible for your Childs religious and spiritual life.
This is googles definition
In the modern baptism of an infant or child the godparent or godparents make profession of faith for the person being baptized and assume an obligation to serve as proxies for the parents if the parents either are unable or neglect to provide for the religious training of the child, in fulfillment of baptismal ...
God parents are usually not family or they are distant family if you want your child to go to your mother if something happens to you just do not pick any god parents because she is the grandmother she can take the child in