Ok, please have some perspective. They aren't clawing each others eyes out over food. They have a little rough and tumble play over a banana. These little monkeys are going to be BIG monkeys someday. When they grow up they are not going to be chained up inside a house, they are likely going to come and go as members of this house hold. Many Southeast Asians are Buddhist and believe in reincarnation. To this woman, the monkeys may be lost children. So it is up to HER to let them be who they are. Right now it is brother-sister play with the "winner'" getting the banana. But as ADULTS MONKEYS other troupe members will try to take their food. They are learning to hide it, eat it quickly, run with it or defend their food from the aggressor if they must. ALL animals learn life skills for the wild by this kind of play.