During a hearing at the Evans courthouse, Judge James G. Blanchard Jr. made his ruling after concerns were raised about a request for family counseling that would have included Dean.
A grand jury indicted Dean, a former county commissioner, on two counts of child molestation Feb. 2. He pleaded not guilty to those charges Feb. 18.
As part of Dean's bond, Blanchard had ordered that Dean not be involved in counseling with his family because one of the children is the alleged victim and the others are potential witnesses.
A counselor who has met with the victim several times and the other children at least once recently requested that Dean be involved in an "intensive, family counseling" session with two specialists from Atlanta.
The counseling request was denied by the children's guardian ad litem and by the Department of Family and Children Services. The guardian ad litem, appointed by Blanchard last month, said a DFCS case worker initially appeared willing to approve the family counseling session.
"I did not agree with that in the middle of a court proceeding (involving) criminal charges and did not feel that was appropriate at this time," the guardian told the judge.
Renee Dean expressed her willingness to participate in the counseling, if the court would allow it.
Blanchard said he was concerned about the children's being influenced, possibly coerced, in their testimony. He said he has seen numerous cases in which children later change their testimony and were obviously influenced or coached.
"One of the purposes the court has is to make sure the criminal procedure operates ... without any contamination," Blanchard said. "I'm not saying that is taking place in this case."
The judge referred placement of the children to the Columbia County Juvenile Court.
The judge also ordered that the children continue treatment without the counselor who suggested involving Dean. Continued treatment will be arranged by the Juvenile Court.
The alleged victim is one of five children -- four girls and a boy -- the Deans adopted from Guatemala in 2008. They have two biological sons.
Dean has not lived in the family's Harlem home since the DFCS temporarily removed the adopted children in October.
The eldest daughter, Marlin, ran away last October to Mexico.