Weird asf notes left by my stepmom

So for context I’ll be watching my parents dogs until Monday. They left this morning. I decide to check on the dogs. I go in my parents room, find one of their dogs (he’s right next to the wall) and bend down to pet him. When I stand up, I look at the wall and notice these notes right next to their bed on my stepmoms side. I took a closer look, and the first one says (ik the pics aren’t very clear) “KEEP YOUR MOUTH SHUT if you hope to survive here” and the 2nd says “You will NEVER be part of this family! UNDERSTAND THAT.” As far as I’m aware my stepmom has no history of mental issues, nor has any reason to write me these notes so I am unsure who these are directed at but considering she knew I’d be in their room for the next few days, I’m sure she’d knew I’d find them. Also by the tone of the note it seems she’s addressing someone that lives in our household (it’s only her, me and my dad that lives here)

I plan on asking my dad about it tomorrow, but in the meantime I just wanted to share to weird out other ppl that’ll find it interesting🤣