How to stop iphones from receiving each others texts?

Okay so everytime i update my phone, my mom, sister & i end up receiving each others messages as if it was sent to us. We see everything and i really am tired of my mom reading my messages lol. How do i stop this? I know you can go to the settings and then uncheck the phone number you don't wanna be linked to but it still does it everytime i update? Is it because we share the same apple ID?

Go to Settings>FaceTime>iPhone Cellular Calls>OFF

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