Unlimited family texting and data for att?

ok so if i have two people on a plan and we both have unlimited texting, is that unlimited family messaging?!?!?! and if it is unlimted family messaging, does that mean we can both get unlimited data for 10$ each??? and if so, can 1 person just get the unlimited data and the other person not get it??? and if i do that, i can use the motorola backflip right? please answer all my questions asap!!!!!
 
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