As a 14 year old guy, What should I do if I suspect that my 23 year old sister is doing gross and inappropriate stuff with her boyfriend?

My sister stays up late or over-night with her boyfriend my parents allow it. Why else would she be around him at night ? If theres a need to talk they can always do it daytime or through text/call. No doubt they’re having s*x. I told my parents and they don’t care to stop her. Idk why they’re not parenting her - I... show more My sister stays up late or over-night with her boyfriend my parents allow it. Why else would she be around him at night ? If theres a need to talk they can always do it daytime or through text/call. No doubt they’re having s*x. I told my parents and they don’t care to stop her. Idk why they’re not parenting her - I thought they’ve always been pretty strict about raising good kids???Btw I also mailed condoms to her house as a joke to indicate that SOMEONE KNOWS what she’s doing wrong! I didn’t leave behind my name or address
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