Maybe that you ever thought. Love conquers all and that applies even for the adopted child. Science can't measure that.
The connection between God and man is the strongest connection because He created a void in ALL mankind that ONLY HE can fill and He died for mankind because HE LOVED... That's the connection that is important and can have everlasting results.
BTW, those with the desire to eat or kill their children didn't get 'the science' memo. They show what 'mankind' is capable of no matter what supposed connection they have. Trust God, never man.