Yes, thank you all of you for tips and information and thoughts on this. I have pitched it to my wife and we will discuss and try and make a plan if it is feasible.
I know the kids will learn a lot of history in school but since we are actually going to the area as a family I figured this could be our best chance and their best chance at seeing it up close.
The Radiustours link above looks like a good one too because the tours you can get through the actual Dachau website appear to be for 14 and above, while Radius can work for our younger aged children.

MM