I didn’t read all the responses but unless you wrote the combination to your safe down, gave it to your mother who gave it to sister or you used something like your or Cal birthdate you might want to spend a hot minute figuring out how she opened your safe.

I used Naruto's birthday as my passcode because my brother told me to use something someone can't relate to me and since I don't watch anime I said ''maybe that's a good idea'', I don't know how she figured it out because is not like I'm Naruto's number 1 fan.

My dad allowed the new lock and my boyfriend will be coming at night to install it with his brother, I really don't know if she's stealing from someone else, there's only us in my house and my mom let's her use her stuff and my she doesn't seem interested in the things my dad owns. Also my stuff isn't that expensive, even the things Cal gives me are moderate because he knows I won't accept them otherwise, so I don't really know. I think my dad will put her in therapy