If one is not careful, it is easy to interchange, Children, with Seed. Both come from the same? No. Nodding and slumber can result in deception. Let us allow the Scriptures, to speak!
Rom. 9:4-11 The Apostle Paul ask a question: "who." "To whom pertains the adoption, and the glory, and the covenants, and and the giving of the Law, and the service, and the promises."
Rom. 9:6 "For they are Not all Israel, which are of Israel." What!
Paul continues with "children" and "seed" - which we absolutely, must know the difference. Abraham = the father of many (nations). Many can claim to be the "seed" of Abraham: but Sarah = the Mother of One Nation. Her children, beginning with "Isaac shall Thy seed be called."
In John 8, Immanuel-Christ-Jesus was confronted by some Kenites (progeny of Satan) who claimed to be "seed" of Abraham. Immanuel-Christ-Jesus exposed them as Not being "children" - because of their works: they sought, and did, murder Christ.
One must know the "key of David." The "House" of Israel consist of twelve Tribes. Who begot whom, down through Christ. Rev. 3:9 is important.
Gal.5 list the works of the flesh. It also list the fruit of the Spirit.
Our LORD knows the difference - and so should we.