NOBU & Multiple subscriptions

I would like to be able to have multiple active subscriptions to Norton Backup active at one time and was trying to find out if this is possible with one account.  I have my own household with our 4 computers and then my parents household with their 4 computers.  I take care of their computer needs and didn't want to have to bother them with knowing about the subscription and activation process as well as paying for it since I do all of that for them.