Router and Networking... Multiple SSIDs and Data Cap per SSID

So... like most of world my family lives online. Having found that ISP pricing in Alaska is horrendously expensive, I want to find a solution that I can create 4 SSIDs, one for each of my three kids (ages 12, 14, &16) and one for me and my wife, and place a data cap on each SSID so that I can't be hit up with the bills that come with overages. I figure with individual SSIDs they can use what ever device they have with out having to detirmine MAC addresses or IPs used or any of that other stuff.

I would like to have just one router be able to accomplish this. I have an older router, an Apple Time Capsule I bought about 6 years ago, but as I don't use Macintosh computers any more, I would be happy to buy a new router and get it set up to manage this dilema.

Any Advice or suggestions will be greatly appreciated.

Thanks.
 
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