Genesis 1:4

1:4 God saw that the light was good, so God separated the light from the darkness.

Genesis 1:6

1:6 God said, “Let there be an expanse in the midst of the waters and let it separate water from water.

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.