ELI5: Explain Like I'm 5

Abraham's family tree

Abraham was a really, really, REALLY long time ago. And he was related to lots of people! He had a wife named Sarah and a son named Isaac. Isaac had two sons named Jacob and Esau.

Jacob had 12 sons and those sons became the twelve tribes of Israel. One of Jacob's sons was named Judah and he became really important because Jesus was a descendant of his.

So, to summarize, Abraham is like the great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great, great grandfather of Jesus!