Especially if the narcissist is the mother. I refer to this as conditioning. As a child, the narcissist conditions the child(ren) to not dare question her in public 1) Since she is clever at maintaining a front that she is a wonderful mother, with a smile on her face, she'll manage in a few short words to make her child look stupid and 2) Once in private, that child will pay dearly for having the audacity to speak up in the first place. The pain from some abuses can't be seen by the eye!!
Growing up with a Narcissist means it's all about the outer image of a perfect family/ perfect parent. What goes on behind closed doors is not that at all. Often fear tactics are used to "control" and keep the "truth" from being told.