Question about upgrading on Verizon?

My mother is the "owner" of our family share plan, and the phone I wants cost $99.99. See has a new every two thing, but that only applys to her one line, my question is could I upgrade my phone on her line, then switch the phone to my line, and not have to pay a data plan on both lines for both years, or would the the data plan be stuck on her line as well?
 
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