Genesis 6:2

6:2 the sons of God saw that the daughters of humankind were beautiful. Thus they took wives for themselves from any they chose.

Genesis 13:11

13:11 Lot chose for himself the whole region of the Jordan and traveled toward the east.

So the relatives separated from each other.

Genesis 18:7

18:7 Then Abraham ran to the herd and chose a fine, tender calf, and gave it to a servant, who quickly prepared it.