My fiance passed away recently and his family did exactly this. They read our private emails/texts and saw all the photos I ever sent him. They went through his computer, etc. Basically anything that he stored information/chats on, they dug through it all. Then his brother sent me an email letting me know he had done it and proceeded to say horrible things to me (less than a week after he passed). It hurt and felt very traumatic on top of the pain I was experiencing.
My fiance's family was emotionally abusive to him and it had been an issue in our relationship for a long time. He constantly came to me telling me how they treated him and how upset they made him. I experienced/witness some of their abuse myself and they targeted me a few times. I avoided them a lot after the first year, but he still lived at home.
I want to know if what they did was normal in your opinion. Would you do this if say, your son/sibling passed away? We were both adults, had been together over three years and were going to be getting married this month.