What makes the Kennedy family so unique?

I chose Dollhouse by Kourtney, Khloe, and Kim Kardashian before I chose any type of question. This fictional story has similar attributes to the three sisters. For example, the three main characters in the story all have first names that start with a "K". However, I did find a book called Mrs. Kennedy and Me by Clint Hill and Lisa McCubbin that I find very interesting. I have always been very intrigued by the Kennedy family and all of the tragedy that went along with them. What makes the Kennedy family so unique?

I first heard about this book in Washington, D.C. I was in a museum, and was captivated by the summary on the back of the book. It amazed me that this family had to deal with so much grief. I also find Mrs. Kennedy a role model. She had so much grace and poise. She was captivating. It is fascinating that her personal body guard experienced all of the hardships as though they were his own family. They developed such an amazing partnership and even friendship. This book seems like it might have the answer to my question.