Euphoria, including her grandparents.The actor, who plays Cassie Howard in the HBO teen drama, discussed the show’s premiere during an appearance on The Ellen DeGeneres Show.“So, for the premiere, I invited my entire family,” Sweeney said.When she clarified that meant parents, uncles and grandparents, she added: “I was like, ‘it’s the Hollywood premiere! You gotta come!’ We were all sitting next to each other and – giant screen, like ginormous screen. I was on the floor.“I wasn’t thinking.