Feb. 6, 2011, marks the 100th anniversary of Ronald Reagan's birth. Many events are planned to commemorate this centennial, but perhaps none is more personal than My Father at 100, a memoir written by the 40th president's youngest son, Ron Reagan. 

Reagan and son play touch football in the backyard of their Sacramento home. — Walter Zibowski / AP Photo

From Seattle, he tells Inside E Street's Lark McCarthy about his late father's love of sports, his own concerns about his dad serving a second term in the White House and how the family dealt with Ronald Reagan's struggles with Alzheimer's disease. Ron Reagan believes it was a "virtual certainty" that his father had Alzheimer's while president. Watch this heartfelt interview that tells the story of a special bond between father and son.