According to investigators, the parents of baby Lisa Irwin have not fully cooperated in answering questions about the evening the 11-month-old Kansas City, MO. girl disappeared.

 Baby Lisa Irwin Missing: Why Won’t Lisa’s Parents Allow Baby’s Brothers to Speak to Police?

On Oct. 25, Kansas City Police Capt. Steve Young said this to ABC News.com.

"We need them to sit down apart from each other, with detectives, and answer the tough questions detectives have for them concerning what they may or may not know about anything, who came and went [the night Lisa disappeared]."

The parents did not give in to Young’s request, and later hired an attorney John Picerno, who has stated his unwillingness to have his clients speak to police.

"My own view is that my clients should never talk to police. I tell them, 'The prisons are full of people who talked to the police. The police are going to do what they are going to do, with or without your cooperation and your statement,'" Picerno said.

Still, many are asking why parents Deborah Bradley and Jeremy Irwin are not allowing the child’s half brothers, aged 5 and 8, who were in the house at the time, speak to police?

According to People, “They also have not agreed to let their other children, boys ages 5 and 8, to meet a second time with a child services worker to talk about that night.”

Other commentators have also said that although it is understandable that the parents are following the guidance and instructions of their attorneys, but that it should be even more important to them to try every means necessary to find their little girl?

One analyst has said: “…this is their child, who’s missing, and people are going to hear that and they're going to say, 'I don't care what your lawyer is telling you, you have to help them [police] in every way you can.' "