I cannot find the original, about 3 weeks ago, post which asked about family restrooms facilities at Dulles Airport near Wash DC. I flew through Dulles on December 3rd. I am pretty sure I spotted a family rest room in the main ticketing lobby, outside security. But once at my gate in Concourse A, I found no family restrooms. I walked up and down the Concourse A 9 times--for exercise--as I waited.
However, there were family restrooms in the Grand Rapids Ford Airport, at least in Concourse B.
Naturally if the original poster were flying pretty through Dulles, this would make it a bit more challenging. Let us know what happened. Hope this helps. Does anybody else know or care to find out at other airports?