Update 6/26/2014. All three fledglings were seen together today with both parents. They are just about a month old now (first seen 5/31). They have moved ponds from the back of the subdivision to the front.
They have grown since my prior post and the parents are still very protective as they cannot fly yet. I think I saw the 3 still, but, I cannot be sure as it is hard to keep track of them being so small, in grass taller than them, and viewing through my camera zoom to even see. I am also in my car because the parents have a fit if you get out. They are calm if you stay inside so that is what I do.