Active Directory: 2003 to 2012 R2 Upgrade across single forest with child domains

I just have a quick questions about something that should be simple. We will be upgrading our current domain from Windows 2003 functionality to Windows 2012 R2.  This forest has domain and two child domains.  I have two questions.  Since we
have to do this in a few steps in order to get up to 2012 functionality I am wondering where is it consider best practice to start?  In the Root (top level) domain of the forest or in one of the child domains?  I want to say the root (top level)
domain is where I would place my first Windows 2012 R2 box and promote it to a domain controller.  Then move to the child domains one the root domain controllers have all be replaced with Server 2012.
Kristopher Turner | Not the brightest bulb but by far not the dimmest bulb.

Yes.  We are working with the client to migrate any dependencies off these 3 NT legacy domains.  We will be able to decommission 2 of the 3 without any issues.  However, they still have an old NT box running SQL 6.5 databases for a application
still in production.  Yes, they are very aware that NT isn't supported, that that version of SQL isn't supported, and that this will hold up their upgrade.
Our plans for them will be to deploy all new Windows Server 2012 R2 domain controllers but keep the domain and the forest functionality at 2003 in order to support that final NT Legacy domain until they can get that application migrated.
Once that NT domain is decommissioned then we can raise the functionality of the rest of their domains from 2003 to 2012 R2.
Kristopher Turner | Not the brightest bulb but by far not the dimmest bulb.

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