Genesis 8: 15-16 "Then God said to Noah, "Come out of the ark, you and your wife and your sons and their wives."
The waters have receded now, the land is dried up and able to be walked upon again. So out comes Noah, his family, and every living creature he has upon the ark. Noah builds an alter and offers up pleasing burnt offerings to the Lord.
The Lord is pleased with the aroma and says in his heart that he will never again curse the ground because of man or destroy all living creatures as He had done.
So begins the repopulation of the earth, among all the animals and Noah's family too. Each animal of its kind who now move of their own accord to parts that befit their needs. Each male and female animal will reproduce and have babies of its kind to help repopulate the earth now as all animals are gone from the earth except those that came out of the ark.
Noah is told to be fruitful and multiply. The bible doesnt specifically say if Noah had other sons or daughters other than Shem, Ham and Japeth; for it is these sons who would build family lines that would increase upon the earth as time went on. All the races and peoples of the earth come from Noah's three sons.
