Depends. How close our you and your sister? Does she enjoy DOA as much as you? And most importantly (from the way you post and your profile pics), is she a snitch?
We're close xD we play DOA anf tekken all the time but she holds a grudge against me since she never can beat me, in fact when we did first to 15 in Tekken a while ago, she demanded we play 5 more and I beat her again xD
And nah she's no snitch, we don't tell on each other but she probably would be surprised at me for the most part since im very quiet and reserved irl. Plus we play polar opposite characters and she thinks anyone I play is "broken"