The moment the word "children" appears, what comes to mind most the time is the result or outcome of a process. Especially when the psalmist was describing children in Psalms 127:3-5. My eyes were open to seeing results as children. Definitely, children have fathers. Let not go into defining children ( you can always read my post on CHILDREN), But my concern is that sometimes we (Christians) are referred to as Abraham's offspring and at the same time, we are called the children of God. How are we children of God and also Abraham's? It is possible that we are the offspring of both God and Abraham (His friend). We are considered as Abraham's offspring when we believe (Galatians 3:6-8), because the first to exercise Faith in God was Abraham and we are called his children because we are doing exactly what he did which was counted to him as righteousness(John 8:39) - FAITH . So we (believers) are the re-produced version(children) of the Father of Faith - Abraham...
The perception of Truth may vary, but the core remains valid and LIGHT sees TRUTH...