As for Jon Snow’s lineage, it’s indicated that George R.R. Martin’s novels and Game of Thrones’ revelation do not deviate from one another.
That Jon Snow plot point is still a novel cliffhanger that Martin has yet to resolve.
George R.R. Martin had hoped to complete all of his novels before the television show came to an end, but Game of Thrones broke un-authored ground in Season 6, which saw the reveal of Jon Snow’s fate, as well as the Battle of the Bastards.