S.K.
Label 4 garment bags (with fishnet and zippers) with your sons names and give it to them. Ask them to daily put their dirty socks in their bag. Toss the bags in the washer and dryer and you will have less sorting to do later. Or you could give the garment bag full of clean socks back to your boys and ask them to do their own sorting in their rooms. To further this, buy 8 pairs of garment bags. At any given time, 4 of them will have clean socks yet to be paired and the other 4 will have dirty socks. Two bags for each boy, with just their names on them.
http://www.sockcompany.com/sososowabag.html