Season 6, episode 24. Aired 05/10/2009.
http://abc.go.com/shows/extreme-makeover-home-edition/episode-detail/cerda-family/207273
April 2010 it was on sale, the family moved to Portland OR and a totally new story came up. The story about the medical health of the children came in doubt, instead a case of child abuse by the mother turned up.
http://www.zillow.com/blog/2010-04-06/cerdas-extreme-makeover-home-in-vegas-sells-for-317k/