I’m the legal guardian of my two younger siblings and I need some advice from parents. Please help?

ItsChloe1999

So I’m 24 years old and 3 years ago both my mom and dad died in a car accident. As the only family member left that’s living in the US, the courts made me legal guardian to my two younger sisters aged 13 and 16. I haven’t had a problem looking after them on the day to day but I now find myself in a unique situation with them and I could do with some advice from people who are parents.

Chelsea, the 16 year old, came up to me yesterday and informed me that Charlotte, the 13 year old, has been stealing and wearing her thong underwear.

Chelsea has only been wearing thongs for a year and Charlotte hasn’t approached me about wanting to wear thongs at all.

I get it, I was exactly the same at her age, I was wanting to wear thongs because I wanted to feel grown up and sexy but was petrified to ask my parents for permission so I brought several pairs and wore them secretly until my mom found them in the laundry and gave me ‘the talk’.

Obviously, Charlotte can’t carry on stealing and wearing Chelsea’s thongs but at the same time, is Charlotte old enough and mature enough to understand what I’m saying if I gave her ‘the talk’ and let her have her own thongs, I don’t think so. And the last thing I want is for Charlotte to be a teen mom.

Any advice from people who are parents, especially if you have daughters would be most welcome. What would you do if you found yourself in my situation? Thanks.

Updates
7 mo
Just to clarify…

Chelsea, the 16 year old only started wearing thongs at age 15 because she started gymnastics and in gymnastics competitions you get points deducted if you have visible panty lines. Chelsea is also very mature for her age and works a part time job when she’s not at school, so I decided that she was mature enough to wear thongs responsibly and let her wear thongs as daily underwear if she so wished, which she does.
Updates
7 mo
Charlotte, the 13 year old, on the other hand is very immature and has a mental deficiency which means she doesn’t act her age according to her doctor. I worry that if I let her have her own thongs, she will not wear them responsibly and would wear them for all the wrong reasons.
I’m the legal guardian of my two younger siblings and I need some advice from parents. Please help?
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