Hello, our kids have each received an Asus Transformer pad for Christmas. Now I need to set them up. I am debating the best way to do this. I have a google account but don't really want them using it and having access to my email. I also use the google calendar for all their activities so they need access to this on their tablets. However, I do want to be in control of purchases in the google play store. Should I set them each up their own google account or use mine. They are 8 & 9 so I don't expect them to be emailing anyone. If they buy items in the google play store, do I have to buy it twice if they are setup under their own accounts. Ay guidance or tips would be VERY much appreciated. Thanks.