37   I know that ye are Abraham's seed; but ye seek to kill me, because my word hath no place in you.    38   I speak that which I have seen with my Father: and ye do that which ye have seen with your father.    39   They answered and said unto him, Abraham is our father. Jesus saith unto them, If ye were Abraham's children, ye would do the works of Abraham.    40   But now ye seek to kill me, a man that hath told you the truth, which I have heard of God: this did not Abraham. ~ JOHN 8:37-40

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Being the physical seed of Abraham doesn’t mean much unless you are born by the will of God. Obviously, Ismael was the seed of Abraham but was not a child of promise. While the Royal Seed of Abraham are those that are born by Christ, there is an elect in Israel that were the physical seed and inheritors of a physical land. It is through that physical elect seed that the Royal Seed were to come, placing Israel in a special place with God.