Two Layers of Parental Controls?

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Two Layers of Parental Controls?

Hi everyone,

I'm looking for a DVR that has two layers of parental controls. Does such a device exist? 

In case there's any confusion, let me explain. I have a 6-year-old and a 13-year-old who both use the televisions in my home, and I have different standards for what each is allowed to watch. I want to be able to setup one code that will allow my 13-year-old to bypass the controls that prevent my 6-year-old from watching anything that is not kid friendly. This part is easy; almost every DVR can do this. However, I then want the ability to set a separate code that will prevent my 13-year-old from watching R-rated or TV-M programming. 

Are there any devices out there that can do this? TIA