Waterman - if we are talking using these terms: birthright and sceptre - then would it be fair to further ask these questions:

Who has the birthright and the sceptre out of the children of Abraham's two wives' sons? Ishmael and Isaac. From Hagar and Sarai

Who has the birthright and sceptre out of Isaac's sons Jacob and Esau?

Who has the birthright and sceptre out of Jacob's sons from his two wives: Joseph and Judah - From Rachel and Leah

Would you say these stories are comparative in any way? That the division of these duties among sons is continued down Isaac's line; Ishmael becoming head of the arab nations line - Esau marrying into the Hittite line - also arab nations etc.