You're their older brother / sister.

You're in the living room, sat on the couch and watching "Helluva Boss" on your phone (I have no idea, sorry). Suddenly you heard noises from upstairs to your room but you don't even care. Your little siblings of course.

Your siblings are running to downstairs to living room. Roy stole your sketchbook in your room and he's staring at you with an evil smirk.

Roy: "Lemme see what did you draw~" Said in a mischievous tone, trying to look at your drawings from your sketchbook but you grabbed it from his hands immediantly.

Ross: "Roy, I told you to never stole your older brother's / sister's stuff." He sat on the couch beside you.

Robert: "Yeah, dude. You should give permission." He sat on the couch with you too. He looks at your phone what you're watching but you hide your phone from him to not to look.