The history of Abraham’s family is not just a history of person. It is the prophecy telling us about the qualification to inherit the kingdom of heaven.
In the Bible, Abraham represents God the Father.

(Lk 16:19-24) "There was a rich man who was dressed in purple and fine linen and lived in luxury every day. At his gate was laid a beggar named Lazarus, covered with sores and longing to eat what fell from the rich man's table. Even the dogs came and licked his sores. "The time came when the beggar died and the angels carried him to Abraham's side. The rich man also died and was buried. In hell, where he was in torment, he looked up and saw Abraham far away, with Lazarus by his side. So he called to him, 'Father Abraham, have pity on me and send Lazarus to dip the tip of his finger in water and cool my tongue, because I am in agony in this fire.'

Here, when Lazarus died, the angels carried him to Abraham’s side. If we enter heaven, whose side will we be carried to? It will be God’s side. Also, Abraham was called Father. In heaven, who can be called Father? It is God. Therefore, Abraham represents God and Abraham’s heir represents God’s heir. So, if we understand the history of Abraham’s family correctly, we can know that who can be the heir of God.

In Abraham’s family, there were three candidates who could inherit Abraham’s estate. The first was Eliezer, but he could not become the heir of Abraham because he was not born of Abraham.

The second candidate was Ishmael. He was born of Abraham. Then did he become the heir of Abraham? No. He also couldn’t become the heir of Abraham. The reason is that he was not born of Sarah.

(Ge 17:18-19) And Abraham said to God, "If only Ishmael might live under your blessing!" Then God said, "Yes, but your wife Sarah will bear you a son, and you will call him Isaac. I will establish my covenant with him as an everlasting covenant for his descendants after him.

So only Isaac, who was born of Abraham and Sarah, could become the heir of Abraham. It shows us that the maternal line is the decisive factor in choosing the heir.
It means that to become God’s heir we should become the children of Mother. Then do we have our spiritual mother?

(Ga 4:26) But the Jerusalem that is above is free, and she is our mother.

We have our spiritual Mother and, like Isaac, we should become the children of heavenly mother to become the heir of God. It means that only those who believe in God the Father and God the Mother can inherit the kingdom of heaven.
So let us believe in God the Mother and enter the kingdom of heaven!!