Mothers have lied to their children since the invention of language. Sometimes the lies are for the mother's convenience, such as the admonition that it isn't safe to swim for an hour after lunch. Other times, the lies are to protect the child's ego from a harsh reality.
The relationship between a parent and a child is the weirdest relationship you will ever have. It is close and intimate. It is cold and distant, with hearts raw and broken. And this could vary not by the year or the day, but by the moment.
The meaning of the challenge of separation from our mothers is the meaning of the birth of the ego, the coming into existence of an "I," a self, an identity. The part of the self that is capable of mature love hinges on this mastery.