Lets Begin to become a team mate

Basically every human being is slave of  individual ego, from months old kid to ninety old person have that individual ego, which makes every human a selfish person, thinks about self interest first rather to think about others, so that property makes human to make his own world around  which consists that self centeredness, any person who is in his territory that became his liking, and those who are against  are his opponents and dislikes, this infighting goes around in every individual, even in kids , only thing is that their conscious mind is not fully evolved to respond towards the opposition, so we call them ignorant, fact is that kids are only ignorant from their conscious mind .Remember every individual is a complete soul, so he has already pre-recorded notions, which he carries with him, birth to birth .Hence we cannot give our thoughts to anyone , what we can give is love. Every individual has their own set of thought process.
The question  is how to bring integrated feel among family members or between two individual souls.esp when we are talking about kids? their conscious mind is yet to evolve.? how to make learn kids to become a team player?
My practical solution is by making every one to meet at common purpose goal is to make them involve in a sport or a game with strategies  as well as with coordinating skills. Play a game on a specified date every month or at convenience  isn't it good idea? playing a sport or organising a small recreational activity will make kids to learn to become a team mate. we know it , but we are with full of excuses why and how we cant do, yes understand the difficulties of consensous and time constraints, but we have an intention and conviction we can certainly initiate. In the homes who dont play either games or not even dine together, its hard to find a coordination between the people. Hence we cant even infuse a common goal.
 Don't we remember our own school or college days when we feel so enthusiastic with school tasks and feel of togetherness and oneness towards the task and with other class mates ;Inspite of the fact that we get more love and care from  our own parents yet we drew towards outside; in most of our thoughts? why is that so!..In school every one has a common purpose so we begin to relate each other very easily, whereas at home esp when there is disharmony in the couple or parents it is very difficult that a kid find himself connect with home or ideas /thoughts spread at home.The solution which come to my mind is begin playing a game on fixed date whole family than slowly involve our neighbors  relatives or known person to make teams to make kids learn to become a team mate, which eventually in his own life make him learn lot of things.Age appropriate games could be easily chosen and a strong bond can be made within a family with a meaningful purpose.