The family has maintained from the beginning that Lisa was abducted from her bedroom inside the home while her mother and brothers were asleep in another room. The family moved out of the house after the disappearance, and the home became the site of multiple police and FBI searches that included cadaver dogs and agents in hazmat suits.
Lisa's parents Deborah Bradley, 25, and Jeremy Irwin, 29, lived at the home with Lisa and her two step-brothers, ages 5 and 8, who were interviewed by an FBI child specialist last week. Authorities said the conversations with the boys went well, but that they did not make any significant discoveries.
Now, the biological mother of Lisa's 8-year-old half-brother Blake has filed an emergency motion for temporary custody of her son, according to ABC News' Kansas City affiliate KMBC. Blake is the son of Jeremy Irwin with a woman named Rasleen Raim, who lost custody of Blake in 2008.
KMBC reports that Raim said she is concerned about "her baby's" safety, comfort and peace of mind, according to a news release from her attorney Dorothy Savory. Savory did not respond to requests for comment.
On Friday, Lisa's first birthday, Bradley and Irwin's attorney held a news conference in which he claimed that police have indicated that Lisa's parents are suspects in her disappearance.
The police denied indicating to the parents that they are suspects, marking the latest round of sparring between the parents and police.
When asked if he thought police consider Lisa's parents suspects, criminal defense attorney John Picerno replied, "Absolutely. They've told them as much, Debbie in particular."
The Kansas City Police Department denied the claim that Bradley and Irwin are suspects.
"We don't have any suspects," Police Capt. Steve Young told ABCNews.com. "We still would like to speak to them again."
Police say Bradley and Irwin have not agreed to sit down separately for extensive police interviews since Oct. 8 and say there are still questions they would like answered from the couple. Authorities say the parents have responded to questions regarding specific tips or issues, but have not agreed to unrestricted questioning.
Meanwhile, the attorneys and private investigators working on behalf of the Irwin family are focusing on a mysterious phone call placed from one of the cell phones Bradley claims was stolen from her home while she slept the night Lisa disappeared.
A Kansas City woman named Megan Wright received a 50-second phone call from one of Deborah's missing cell phones around midnight the night Lisa disappeared. Wright told "Good Morning America" that she did not have the phone with her, know who answered it or know who was calling.
"This whole case hinges on who made that call and why," New York private investigator Bill Stanton told "Good Morning America." "We firmly believe that the person who had that cell phone also had Lisa."
A male witness who wished to remain anonymous told "GMA" that the person who answered the phone was a drifter named Dane who was living in a house Wright reportedly shared with other people.
"Every time I was up, I saw [Dane] on the phone, hunched in the corner, being very secretive," the witness said. "I would say Dane did not do anything to that baby. But as for him covering up something for a friend, that's a whole different story."
The Kansas City Police Department insists that while they are looking into the tip, it just one among more than 1,000 other tips. Police say that while they would like to speak to Dane, his significance is "minimal" and he is not a person of interest.