And I'm quite certain that your relative with his admittedly low level of things has personal knowledge as to exactly what the President has the ability and authority to see.
That is the worst type of self-important speculation imaginable on the part of your releative. Has he spoken to the President? Has he been present when the President was refused access to information he requested? If not, I submit that he is speaking from a portion of his anatomy better reserved for other bodily functons.
I'm sensing a pattern. It seems as though people on "your side" of this issue take concepts that may be applicable in a general sense and apply them to specific situations without any idea of whether they actually fit. Your relative gets told "only people with so-and-so clearance can view this." From that, he extrapolates that the President is not permitted to see it. What he ignores is that the person who gave him that general instruction obviously wasn't referring to the President, because your relative had no reason to know whethe the President was supposed to have access.
To put it in more concrete, military terms, lets say I'm the XO of a battalion, and my CO tells me "hey, we're going to be going to the field next week, but don't tell anyone." If I bump into my division commander, and he asks me if we're going to the field next week, of course I tell him yes. Only a literalist dimwit would assume that my battalion CO meant for his comments to apply to the division commander, because the context of the comment is that I'm supposed to keep it quiet from subordinates.
It's the same type of strained literalism that would lead your relative to conclude that general guidance applicable to dissemination of classified information was intended to bar access by the President.