You are absolutely right in saying that if there is only one child in a small family, the chances of him being selfish increases. Because he gets more love. Due to which sometimes we see that due to excessive love, the child becomes spoiled. He doesn't care about big or small. In a big family, people remain busy in their own work. There is no silence in the house and everyone knows their responsibilities. You have expressed your views very well about both the families. Best wishes to you for success in the competition.