The purpose seems irrelevant to me, I just need to know how to do it. However my reason is that others in the household also want to use it which I dont mind at all as long as my stuff is kept separate, I still think it can only be done with 4.2 which is why I wanted to know how to upgrade. If I can do it with 4.1 then fine if some one can tell me how. Thanks
Check out XDA developers site for how to upgrade your tablet to 4.2. But this may mean rooting the device and installing a custom rom. 4.2 may not be available for your device from the manufacturer hence a custom rom may be your only choice in the meantime.
Have you seen this. Don't know how well the apps would work though.
Android updates are usually released by the manufacturer's of the device and updated through their software. The alternative may be to root your device which basically means getting rid of the manufacturer's installation. The risk is that your turn it into a brick and you cannot get manufacturer's updates.
Tablets are usually thought of as single person devices.