Symbols & Signs Short Story Explanation

The short story "Symbols & Signs" is about an old couple that migrated over from Europe to America. The husband was a successful business man back in the day but in their new life in America he relied on his brother Isaac, who was a long time resident of the States. The husband and wife has a son named Charlie who was mentally deranged and often tried to commit suicide. It seems as if the child's problems put a lot of stress on the husband and wife and they grew old and tired quickly. They live with regrets and disappointments which is all a result of the life their child has been living. I like how the story ended abruptly with the third phone call from the person asking for Charlie. In my opinion the call at the end of the story was a nurse calling to inform the husband and wife that Charlie is dead.