Genghis Khan's Mother Had Thousand Of Children

When Genghis Khan defeated rival tribes, he did not drive away their soldiers and abandon their civilians. Instead, he took the conquered tribe under his protection and integrated its members into his own tribe. He would even have his mother adopt orphans from the conquered tribe, bringing them into his family. These political innovations inspired great loyalty among the conquered people, making Temüjin stronger with each victory

source: wikipedia