That particular article doesn't say that DT and LT lived in the mobile home while the children lived in the house. Do you have another source? I've heard somewhere that the children lived in a house and DT and LT would drop food off ever so often, but I thought that was Fort Worth, which would have been 1999 or before. I haven't seen a good source for that story, either, so I don't know where that story came from.
I hope you can post a link, because I'd like to nail that part of the story down.
The Turpins are horrible, horrible people who deserve to spend the rest of their lives being tortured in prison for all of the godawful abuse they afflicted upon their poor, blameless children.
ETA: I see that another poster has tracked down the source (the DA's presser) for the fact that DT and LT lived apart from the children "in the Fort Worth area." i would bet that could be Rio Vista, even though Rio Vista isn't that close to Fort Worth. Pre-1999 (when they lived in FtW) seems too early for young (at the time) children to live on their own.