Leia Organa first appears in Star Wars: A New Hope, played by Carrie Fisher. She is princess of the planet Alderaan, a member of the Imperial Senate and also an agent for the Rebel Alliance. She is later revealed to be the daughter of Darth Vader and twin sister of Luke Skywalker. Over the course of the franchise, Leia becomes a leader among the Alliance and later of the New Republic. She falls in love with and marries Han Solo, with whom she has a son named Ben, known as Kylo Ren when he turned to the dark side.

Is it true that is kylo ren han solo and leia's son?
yes