Why do my messages show on his phone? (iPhone)?

I have a separate itunes account than my mom. My moms itunes account/apple id is connected to my stepdads phone too. When I get messages from my dad they also show on my stepdads phone. Any ideas as to why this happens? How do I make it so that the messages from my dad don't show on my stepdads phone?

You have to be signed it with the same ID for htat to happen

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