Jack: Sort of.

Dad: It shouldn't, because there's nothing wrong with being adopted.  Actually, it's a privilege.  (Pauses to think, then says) As a matter of fact, you're adopted.

Jack: (Startled expression) I am?

Dad: Yep.  You were adopted by God. 

Jack:  When?

Dad: The moment you became a Christian.  The Bible says, "In love he predestined us to be adopted as his sons through Jesus Christ, in accordance with his pleasure and will." 
That verse probably doesn't make much sense, so I'll explain what it means.  The word us means that anyone who believes that Jesus Christ died on the cross for their sins, is adopted into the family of God.  First you believe, then you're adopted as a son, because it pleases God. 
Do you understand all that? 

Jack: I think so. (Ponders the question, then says) When Jesus became my Savior, God adopted me into His family.  (His face brightens) That means I have two fathers: God and you! 

Dad:  Exactly!  God's your heavenly Father, I'm your earthly father.  You're a son of Mark Bennett, but the coolest thing is, you're a son of Almighty God. 

Jack: I never knew that before. 

Dad: Pretty awesome isn't it?

Jack: Yeah. . .

Dad: Two thousand years ago adoption was common among the ancient Greeks and Romans.  The adopted son had all the privileges of a natural born son, including inheritance rights.  Cool, huh?

Jack: Yeah.  Real cool.

Dad: So when we celebrate Father's Day, some of us have two fathers to be thankful for.

Jack:  (Looks puzzled) Here's what I don't understand, Dad.  Why would God want to adopt a bunch of sinners?  Why doesn't he just adopt the angels?  They never sin!

Dad: (Chuckles) He adopts humans because of His kindness.  It's called grace.  Like you said, we're all a bunch of sinners, and sinners certainly don't deserve God's kindness.  But he's kind to us anyway.  That's grace. 

Jack: I learned about grace in Sunday school. 

Mom enters…

Mom: (Feigns surprise, and says jokingly) So you do pay attention in Sunday School! 

Jack: Most of the time. . .

Mom: Dinner will be ready in 10 minutes.