Ezra's parents may be alive because in the episode Empire Day, Ezra said he had no idea what happened to them, along with Hera having a brief smile at the end of Gathering Forces until Ezra walked out. Also, Ezra was thinking of his parents in Empire Day at his tower. To me, I sort of thought his parents were trying to contact him until I heard Tseebo so I thought Ezra may of had a short flashback, which is unknown.