text message confusions

I have familys that use the same cell # on the accts. when send a text to "bob" i will get a response from a different student from the same family member acct say "sarah" it can be confusing especially if I have to got back and read the communication log of a text string and the responses are all over multiple memberships sometimes up to 4. I get with adults cells #'s will be different but with kids its often one cell phone for all the kids and an adult.