Do I need separate login IDs for multiple personal computers


In my household, I have several computers and laptops that I occasionally get into. I'm trying to figure-out the best and most appropriate way to setup the IDs for all of the computers - mine, my wife's, Son, and Mom. Should I use one single login ID / email for all? Or, should each of their computers have their own email address? As a note, I'm on the only one that remotes into other computers.