There are people who know their human, earthly father, but they don’t know the heavenly Father. There are people who know the heavenly Father, but they don’t know their human father.
My human father did not come back from WORLD WAR II. I can say that I did not know him at all. I don’t even know for sure where he died.
But my heavenly Father revealed Himself to me when I was in my teens and I know Him. And I get to know Him more and more by reading the Bible.
But there are also people who know their human father and the heavenly Father.