But that is only if you reading the Eu novels or the alternate univesre comic books where plapy survives or whatever he does. in the movies han and leia never even giet married. And on top of that, leia doesnt decide to have kids because of fear that they would be darksider, but that all changes after the newer book tatooin ghost just a month or so before the old thrawn trilogy. if not for luke, leia might not have been strong enouf in the force to have the visions that convinced her to have kids.