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  (Photo: The Christian Post via National Center for Missing & Exploited Children)
  This is Lisa Irwin, who was last seen at her Kansas City, Mo., home on Oct. 4, 2011. Lisa has a birthmark on her right thigh. She was last known to be wearing purple pants and a purple shirt with kittens on it, according to the National Center for Missing & Exploited Children.

Investigators in the Lisa Irwin case announced Wednesday that they will be conducting interviews with the 11-month-old baby girl's older half-brothers, according to ABC News.

A child specialist is reported to have spoken with the older siblings, ages 5 and 8, on Oct. 4., but this is the first time that investigators will have access to the brothers, who were in the house the night the little girl disappeared.

Police are eager to learn what they might have seen or heard on the night the little girl is reported to have been taken from her Kansas City, Mo., home.

"We have not been allowed access to the children until [parents Deborah Bradley and Jeremy Irwin] agreed to bring them in this Friday," Kansas City police officer Darin Snapp told ABC News.

Snap also revealed that investigators will be taking DNA samples from the boys.

Accordingly, there were DNA samples taken from the home previously that were labeled "unknown," and investigators plan to use the boys' DNA to eliminate some of the unknown samples.

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Investigators have failed to come up with a solid lead, going now on their fourth week into the case.

This latest announcement follows Tuesday's news that police were seeking to interview Lisa's parents separately.

Kansas City police Capt. Steve Young said that he is not in disagreement with the family's attorney, Joe Tacopina, who stated that the family had cooperated and answered questions asked by investigators. Still, Young said the answers so far have not been sufficient.

"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]," Young said.

Wednesday's news further indicates that investigators are focusing more and more on the family and home of the missing baby girl.