iMessage intrusion
So I have just realised that all my iMessages have been going through my step daughters phone for the past two years. I was not aware of this until I found out by chance. My step daughter was never allowed to take her phone to our house by her mother, and was always made to leave it downstairs in her mums house at night, now I know why. She has been getting all my text messages and reading them while my step daughter is not there. How can I prove this? As she is denying it. I have had all mine, my stepdaughters and my husbands phone infront of me and text him from mine and mine from his and both times it’s came up on her phone as a conversation. Which makes me feel sick. All previous conversation had been deleted before I got a hold of her phone. Please Help!!!
iPhone 8, iOS 13