Neither Jon nor Daenerys have any awareness of their (increasingly amorous) relationship, and Sam has no reason to equate Jon with Targaryen history records.
Sunday’s Game of Thrones visit to “Eastwatch” was jam-packed with various jaunts across the map, to say nothing of reunions and returns.
You’re warned of full spoilers for Game of Thrones’ “Eastwatch” from here on out, as well as the theories surrounding George R.R. Martin’s books.
Confirming Jon as a secret Targaryen would shock few fans, but “Eastwatch” introduced a major wrinkle to the Targaryen line that even books have scarcely suggested.