T-Mobile Family Plan and Texting?

My family has a family plan with T-Mobile. We've had it for a few years now, but we've never had texting. I want to get texting now, but if I did would it have to be for the entire plan? I'm the only one who wants it, and we don't want to pay for it if only I'm going to use it. Is there some way to specify texting only on my phone?
 
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