When you have a child who is disabled you step into a world of unknowns.
When Cathy Tanner's daughter was younger, she seemed to fit in with peers even though she had down syndrome. There did not seem to be a large cognitive gap between her and other children, and the author began to think that she'd easily navigate having a mentally disabled child.
But as time marched on things began to change. She saw the gap between her daughter's abilities...