Ava Gilmore is the youngest sister of Rory Gilmore and her mother is Lorelei Gilmore and Ava and Jess has been dating 1 year while Ava is still in Yale and so is Rory and secretly Jess and Rory been sleeping with each other and dean finds out and walks over to Gilmore house and tells Ava that Jess been cheating on her with Rory and also rory is dating dean