I agree that family maybe one of your first school.
You are right man, family is the first set of people a child would know, relate, learn and interacte with. Whatever is being learnt will be part of the child and that would be exactly what such child would take out on people.
Honesty is a really good attribute one should have. But it has consequences, one is being taken for granted another is being hated for always spilling the truth.