How to check if my information is being looked at by my parents?

I am 21 now, but when I was in middle school and high school my parents had a way to see which texts I sent and received(even if I deleted those texts). I am an adult now, and my parents “technically” respect my privacy since I am an adult… but they are also notoriously nosey and snoopy. I changed my apple id account so I don’t share a family one with them anymore, but I want to know if they …

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