For this, we recommend using a SMS/MMS messaging app call Google Messages, where you can setup the Group Chat options, and configure whether you want to:
Send an SMS reply to all recipients and get individual replies (mass text) or Send an MMS reply to all recipients (group MMS)
In this case, we want to avoid the frist option, so we should select the second option to have all text messages sent to the Group
You can download Google Messaging app for free on the Play Store, then onced installed, set it up as the default messaging app. Open it, go to Settings, Advanced, then Group messaging and select the option mentioned above.
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