Anyone can be a father but it takes someone special to be a 'Dad'...

“It is not flesh and blood, but heart which makes us fathers and sons.”
“There is no love on earth greater than that of a father for his son.”
“It is the duty of the father to give his sons a good chance.”
"When my dad did not hold my hand, he had my back.”
“My father gave me the greatest gift anyone could give another person, he believed in me.” 
“Fathers should know that sons follow their example, not advice.”
“Nothing is dearer to an ageing father than his son.”
“A boy’s first hero is his dad.”
“A son does not pass judgement on his father, but he is his father’s conscience.”