Sadly, you don't.
The internal aspects at play are too complex to sum up in a post but in a nutshell:
A lot of parents are actually energetic vampires that feed upon their child. To someone looking its obvious. The child knows something is wrong even though they have no barometer to compare it to as that is their parent. To the vampire its business as usual.
Its very wicked and even sadder. The only solution with these people is to cut them off entirely. No explanation necessary. Easier said than done as a kid. If you're raising them try and install inner resources in them and ensure they know how to set boundaries, accept no transgression etc... as that vampire parent imprint can mess them up for life. Get them into martial arts/contact sport as that is a great offset and way to know the ledge.
Its one of the most common yet least talked about issues plaguing this Earth and is at the root of most people being messed up - especially those who think their folks were perfect due to the way they were warped to fit the emotional needs of another.