Michael Strahan is a doting father to four children and while he is a well-known sports and TV star, he often keeps his family life out of the spotlight.READ: Michael Strahan goes public with surprising past strugglesHowever, the GMA star delighted fans this week after sharing a rare photo of his oldest child, Michael Jr.The picture was posted to mark National Sons Day, and featured Michael with his son when he was a little boy, as well as another youngster, assumed to be a close family member