IPhone 5 problem (text messages)?

So for the past 2 days iv been getting random text messages from an unknown number. I realized it was messages of my mom and her bosses conversation (nothing innapropriate just business stuff) but why am I getting these I'm not included in their conversation. Her boss does not have my phone number and I don't have her bosses phone number but my mom has both of our numbers. Could she have accidentally pressed something while we were texting or talking on the phone that would have made it so It sends me their messages when they talk via text?

You have already bought iPhone 5?

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