God doesn’t look at race the same way we do. He does however keep track of descendants.

You won’t read in your Bible how King David was 1/4 Moabite 3/4 Judahite.

Because God isn’t measuring percentage of blood, He’s looking at the beginning of David’s line all the way to the end at a single glance.

This is why the northern tribes of the kingdom of Israel are not “lost”. God doesn’t lose track of anything. Nor does He care about how much gentile blood is mixed in. He sees the entire line from Ephraim to you reading this post.

Now does this verse make more sense to you?:

“But his father refused and said, “I know, my son, I know. He also shall become a people, and he also shall be great; but truly his younger brother (Ephraim) shall be greater than he, and his descendants shall become a multitude of nations.””
‭‭Genesis‬ ‭48:19‬ ‭NKJV‬‬