I’ll try and be as concise as I can with this post, but I (19F) found out my stepsister (19F) is stealing my money. I’m a server so I keep a lot of cash that’s hard to manage, and I also was saving money for a major vacation so I had a lot of money (about 1k) hidden in my room. About 2 weeks ago, I woke up and realized that the spot I usually hide my money was obviously touched/tampered with. My stepsister had just left that morning after staying with us for a few days. For context, my family has only had contact with her for a month or two, before that she lived with her mom and now she lives on her own. I suspected it was her because the only suspects were her or my parents (who are bad liars). But, because I had just put away money from the shift the night before without counting I couldn’t actually confirm how much was stolen, or if any was at all (most of it was still there). So instead, I took all the money out of that spot and left a specific amount of money ($200). I just got back from my vacation and now I only have $140 in that spot, and she has been staying there during the time I’ve been gone. My stepdad (her bio father) was in complete denial about her stealing the money when I first noticed, but he’s only known her for two months as well (hasn’t seen her since she was a toddler). But now I have proof it was her and I don’t know if I trust having her around anymore. She may be having money issues since she lives in our own while I live at home, but my family gives her gas money and pays for her food while she’s here. She also went shopping a few weeks ago and got a $120 jumpsuit, probably with my money she stole. Any advice on how to confront her, what to say? This isn’t just sibling rivalry, she’s a grown adult and one I’ve only known for a few months. It’s different than my 10 year old brother snagging a $20 bill from my room, it feels deceptive and sneaky and makes me feel like she just wants to get closer to my family for the money.

Tdlr: I know my stepsister stole at least $60 from me, probably more. I’ve only known her for a few months so I feel like she may be seeing my family only for the money, but my stepdad thinks she can do no wrong. How do I confront her?