Skies Aren't Meant to be Bound

For his whole life, hidden child Prince Sora Sawada has never gone outside; or so King Iemitsu thought. Since Sora was 7, he's been secretly going to town. Due to a certain situation, Sora fled from home to the land of Vongola; where he learns about King Giotto's missing son. Why is it that Sora looks so much like Giotto and his son? What is the connection between them? Full sum in