With "Dune 3" being fast-tracked at the time of writing, it might not be all that long until we find out the truth about whether the Chani and Stilgar of the movies are related or not, (though ...

Dune: Part Two Changes Chani's Parenthood From The Book In Frank Herbert's 1965 novel Dune, Chani is introduced as the daughter of Dr Liet Kynes, the imperial planetologist on Arrakis.