Where does it say we must?
I love my Father but not my Dad.
My Sister loves my Dad, but never knew my Father
My Father never loved my Mother.
My Mother hated my Father, never knew my Dad, and stopped loving her Husband!
Would it have made us a family if he had loved my Mother and understood what a Dad really was?
Who knows but …
… Where does it say we must know?
The most important thing a father can do for his children is to love their mother. Theodore Hesburgh