These pretty much speak for themselves. To ask the first one is essentially to answer it. Plus the second one definitely answers the first.
Two things, first, a parent needs to assess how “full dose” (genetic dose), how “alien” their child is. Second, trust his or her instincts — when dealing with psychopaths one must be willing to follow “paranoid trains of thought” because they may not be paranoid at all. My favorite example of the second is the man who doubted his wife so much he slept with a revolver. He wasn’t paranoid enough by half, she killed him by shooting him in the stomach, claiming he rolled over the gun and shot himself.
[This post seemed to bother my cyber minder. He/she cut the internet connection twice.]