I moved out of my parents house in May 2016. I never changed my address anywhere. Is there gonna be any trouble when I try to file hoh and claim my sis and her 2 kids?

I never actually changed my address on my license, with the post office, or at my job. I planned on filling head of household at my sisters house, whom I now live with, and claim her and her 2 kids as dependents. She hasn't had a job all year and I've been supporting them since I moved in.