If the Kushners receive NSC briefings and reports, and they are not members of the NSC, then that is a huge problem and breach of security.
They are not members so they are not able to attend NSC meetings.
What you seem to be saying is that the President will be disclosing to them matters of National Security. I think he can do that legally because he is the decision-maker. He has a right to choose whoever he wants, both formally and informally, to advise him.
I am aware that Gorelick has access to Kushner and that is disturbing. Gorelick is a Harvard law creature and well-connected in Manhattan Jewish circles. NY top tier Jewish society is very liberal and often anti-Zionist. I think we will have to Trust the President on how to handle all that. So far there is no doubt he has the interests of patriots and conservatives at heart.
Like I said...if you can’t see the problem with the Prince and Princess... then no amount of explaining will get you to see.
Maybe in a year or two you will get it.