For context im 17 and mostly live with my dad, only visiting my mom when I feel like, meanwhile my sister is 9 and mostly lives with mom and occasionally going to her dad's house where she doesnt bring her tablet.
During one visit We were playing roblox together and I noticed she had one of thoes bubble text accessories and it was "I❤️my silly bf" so I subtly questioned her asking if she had a bf, to wich she said yes, i tried asking a bit subtly asking if it was like a boy that's a friend or "Boyfriend" and she said "Boyfriend" and tried telling me his username but forgot.
My mom doesnt see an issue with this because she believes nothing inappropriate can happen on roblox, technically nothing can happen on platform because her tablet has VERY limited storage and I doubt she would know how to even make a discord server but still that set alarm bells considering previous behavior.
In the past on YouTube she watched very sexual content both animated and irl, she leaves comments on YouTube videos (idk what they are but mom says she can see them), and she used Ai chatbots wich i had to keep telling her to delete and stop but she would just re-download until she got this new tablet where again she cant download anything but YouTube and roblox.
When I brought my concerns up to my mom she said she had it under control because my sister uses her YouTube account meaning she can see the fact that shes commenting stuff, what she's watching from the search history, ect idk why she doesnt just have YouTube kids she HAS an account on there but doesnt use it and nobody really makes sure shes on it.
Back to the roblox boyfriend thing I went over to my roblox chats to message her something only to notice a group message thing where it said "Brother, Boyfriend, and (someone else idk)", there is saw there was a bunch of chats between her, one guy, and another guy, but we cant read each other's messages because we set our accounts at different age groups so I cant see either message from where I am.
It would require me being in person wich is why I mentioned the situation above, im with my dad 98% of the time because I cant deal with my mom.