You will probably have to be very careful with your choice of words. People with ADD often take things very literally and personally (rather like some forms of autism, apparently. It is technically very difficult to tell the difference a lot of the time since the symptoms can overlap so significantly). What that means is that snide off-hand or discouraging remarks can quickly shut them down, killing opportunities for what could have been an otherwise perfectly productive afternoon. When shut down, people with ADD can have a hard time getting back to whatever it was they were doing before that event.
The fact that you don't individually specialize in a particular thing is probably good. People with ADD thrive on novelty, as long as it doesn't introduce chaos and confusion.
If they get hyper-focused on something that needs to be done, do not get in the way, and let them at it. You'll get some seriously thorough work in that mode unless you distract them.
I also recommend making sure any instructions are well understood. People with ADD will often think they understand what you want, but can unknowingly completely misinterpret what you've said. It's not related to intelligence -- It is usually a result of taking words so literally. You'd be surprised at how vague most people can be, even if they think they are speaking super clearly. People with ADD often counter this with repeating themselves verbatim to ensure that what they are saying is understood or at least acknowledged. You've probably noticed that.