The meaning of "Family"

 Do you know why a orbicular family must include the father、mother and the children?If you have no idea about this,please see the following magic formula (notic the red letters):

The chidren often say a word "Father And Mother I Love You" ,these red letters make a new word "Family", so ,I think you will know how the important father and mother to us, ther are a home,only at home ,you can be a child forever.