He knew a lot about his grandparents - and perhaps he feels he's been endowed with abilities to go into people's heads who are long dead - but, to a certain extent, he's making it up.
“His mouth had been used as a latrine by some small creature of the night, and then as its mausoleum.”
“The President seems to extend executive privilege way out past the atmosphere. What he says is executive privilege is nothing but executive poppycock.”