Unless you meant to say Mueller’s mother’s first cousin was Lee H. Oswald, this whole passage is bunk.
Up until Trump was elected, and all of the fake Russian Dossier / Corrupt FBI (Director Level) stuff started coming out, I thought all the Kennedy assassination stuff about a conspiracy was bunk. LHO was the loan nut shooter as far as I was concerned.
It turns out, LHO was CIA all along. This is pretty indisputable at this point. Once you get comfortable with the idea that the CIA was involved in the JFK murder, you start to get comfortable with the idea that the CIA at the time (at the top) were related by marriage, traveled in the same social circles, and generally had the idea that it was OK to bypass the President.
Win!
Modern ballistic tests have shown that all the damage done that day is consistent with LHO's shots. There is no "magic bullet". That myth was started with misunderstanding of the limo seating arrangements and one misleading view of the recovered bullet.
“Bunk” is too polite a word.
This is pure BSS