Genealogies

I just don't get the point of some of the genealogy listing in the Old Testament.  The genealogy of Jesus?  Yes that is important.  I get that one.  But I'm in Genesis 36 and it is the genalogy of Esau.  Here is just a bit of it.

Genesis 36:1-13(NKJV)

Now this is the genealogy of Esau, who is Edom. 

Esau took his wives from the daughters of Canaan: Adah the daughter of Elon the Hittite; Aholibamah the daughter of Anah, the daughter of Zibeon the Hivite; 

and Basemath, Ishmael’s daughter, sister of Nebajoth. 

Now Adah bore Eliphaz to Esau, and Basemath bore Reuel. 

And Aholibamah bore Jeush, Jaalam, and Korah. These were the sons of Esau who were born to him in the land of Canaan.

Then Esau took his wives, his sons, his daughters, and all the persons of his household, his cattle and all his animals, and all his goods which he had gained in the land of Canaan, and went to a country away from the presence of his brother Jacob. 

For their possessions were too great for them to dwell together, and the land where they were strangers could not support them because of their livestock. 

So Esau dwelt in Mount Seir. Esau is Edom.

And this is the genealogy of Esau the father of the Edomites in Mount Seir. 

These were the names of Esau’s sons: Eliphaz the son of Adah the wife of Esau, and Reuel the son of Basemath the wife of Esau. 

And the sons of Eliphaz were Teman, Omar, Zepho, Gatam, and Kenaz.

Now Timna was the concubine of Eliphaz, Esau’s son, and she bore Amalek to Eliphaz. These were the sons of Adah, Esau’s wife.

These were the sons of Reuel: Nahath, Zerah, Shammah, and Mizzah. These were the sons of Basemath, Esau’s wife.

Here is what I got out of all of that.  Esau is Edom.  So for the rest of my readings in Scripture I know that Esau was the father of the country of Edom.   As far as the rest of it.  I just don't see why I needed to read about all of his kids, who they married and who they begot.  I doubt if many of them are ever mentioned again in Scripture.