the sperm has NOTHING to do with it !!

the "supplier" is far from a Dad. 
He has simply provided or donated something.
He has merely left something behind that indicates he existed.
It doesn't prove worth.  It doesn't allow him the right to wear the Father name tag.
THAT part, has to be earned! 
The REAL man, the genuine article, is the one who picks up the pieces when children are left behind.  He's the one that makes you feel safe & protected.  He's the one that doesn't use the word "step".  He's the one that God sends to you. 
Happy Father's Day Dad- I miss you!