Ok man see you.No we don't. Why do you think that we need to know exactly who was the father or mother of whom? The tree is still there even if we do not know precisely who.
“Now faith is the substance of things hoped for, the evidence of things not seen. For by it the elders obtained a good testimony. By faith we understand that the worlds were framed by the word of God, so that the things which are seen were not made of things which are visible.”
Hebrews 11:1-3 NKJV
“For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse,”
Romans 1:20 NKJV
These Scriptures describe the faith I had but no objective evidence because God is invisible. Because I had faith, when I was lost I called out to God and He delivered me, saved me, changed me, gave me a new life filled with His Spirit. This is something tangible that I have obtained from God. There are many more instances the last 35 years that God has demonstrated His love, presence and power in my life.
Next, He promised me Eternal Life which I haven’t received yet so this is by faith, but He did give me a guarantee by sealing me with His Spirit.
Have a good one!