Hi all, My first post here and I need some advise so it could fall j der parenting but also AIBU? I’m 24 and my sister is 17. I grew taking care of her as well as our parents but due to our huge age gap, I didn’t mind to take care of of her. Even now, from life advise to buying her things like shampoos or clothes, putting her in hobbies, taking her to tutors, helping her with anything and everything. I found out a few weeks ago, she’s been using my toothbrush. Just to be sure, I checked my toothbrush everyday for 4 days and it was always wet. She wakes up first and goes to school early so it was defiantly her. She also has her own toothbrush but she was away on the weekend so she left it in her bag. When I caught her she was denying it and didn’t say anything. She was more embarrassed when I said I’ll tell our family about it rather than feeling actually sorry she did that. 4 days later she apologies and says “sorry for using your toothbrush, I’ll buy you another one when I have money”. We both haven’t spoken since. My anger is festering because how dare you lie about it, ignore me, then apologise half assed. It’s been over a week and we’re still not talking. I genuinely would’ve been fine if she really was apologetic and was trying to make amends like asking me which type of tooth brush and giving dates of when she’ll buy me a new electric one. Even buying me those manual ones in the meantime. But did none of that. Today i mentally just had it as I was hanging up clothes, her clothes were in the mix and I didn’t hang it. Told her to do it herself (I did say it rudely). She called me immature. I said it’s more immature that after she did all that, ignored me and I’m here hanging up her clothes which makes me a bigger bum. I guess I have all this passive aggressive anger and I can’t stand her right now. I don’t want to teach her to apologise either. This may be a toothbrush but moving forwards, this incident showed me who she really is. What if something bigger happens and it’s radio silence from her too. What shall I do.