Romans 9:7-8
Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called. That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.
All men are sons of Adam.
Some are sons of Abraham.
Romans 5:19
For as by one man's disobedience many were made sinners, so by the obedience of one shall many be made righteous.
You cannot inherit election per se, but you can inherit elect parents.
Covenantal presumption kills.
Covenantal continuity saves.
To assume you are saved because your parents are or your grandparents were is to presume upon the covenant, not to put your faith in it.
To continue in the covenant in which you were raised by grace through faith in Christ alone saves you just as much as it saved your fathers.
Romans 11:18-22
Boast not against the branches. But if thou boast, thou bearest not the root, but the root thee. Thou wilt say then, The branches were broken off, that I might be grafted in. Well; because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear: For if God spared not the natural branches, take heed lest he also spare not thee. Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.
Biblically speaking, everyone is a true son or daughter of Adam by genetics, but no one is a true son or daughter of Abraham but by faith.
In other words, history is not essentially a matter of blood relation, but of covenantal relation. What is your relationship to the covenant? Are you a covenant breaker or a covenant keeper?