So, there is no real area that the DLR has that doesn't allow kids, most kids are allowed into the bar areas (so long as they sit at a table instead of the actual bar).
About the only area that I know of that is sometimes age restrictive is the House of Blues concert area, depending on the concert.
So, should there be a "Kids Free" area(s), and if so, where would you put it?
An area in DCA?
And/or the hotels?