PORTLAND — The father of a Portland-area boy who disappeared nearly five months ago has argued in newly filed court papers that his estranged wife is “severely emotionally disturbed” and should not have contact with the couple’s daughter.

Kaine Horman alleged in documents filed Monday that Terri Horman is an alcoholic who suffers from an “undiagnosed personality disorder” and that giving her custody of their 23-month-old daughter, Kiara, could endanger the child.

Terri Horman “has historical problems with the abuse of alcohol, which have impaired her functioning since Kiara’s birth,” Kaine Horman wrote. “Often, (Terri) would pass out on the couch around 7:00 or 8:00 p.m. after drinking heavily and would wake up on and off for the rest of the night.”

He said in July that Terri Horman suffered from postpartum depression after Kiara’s birth.

Neither Kaine Horman’s attorney, Laura Rackner, nor Terri Horman’s attorney, Steven Houze, immediately returned phone calls Tuesday from The Associated Press.

Kaine Horman has repeatedly alleged that Terri Horman had something to do with the June 4 disappearance of 8-year-old Kyron Horman from his school in a rural Portland area. Terri Horman is the boy’s stepmother and was the last person to see him on June 4.

Authorities have focused on Terri Horman during their investigation into the boy’s disappearance, but they have not called her a suspect or a person of interest.

Kaine Horman said in a initial divorce filing that police told him Terri Horman had tried to hire someone to kill him in December 2009.

In court filings related to their divorce, Kaine Horman included graphic text messages and images — described as “sexting” — between Michael Cook, who is Kaine Horman’s high school friend, and Terri Horman that he and police say took place less than one month after Kyron disappeared.

Cook has acknowledged “sexting” with Terri Horman as investigators searched for Kyron, but has said they did not have sex.

Terri Horman said in court two weeks ago that she would agree to an immediate divorce from Kaine, but wanted to delay the division of custody and assets for two years.

Judge Keith Meisenheimer agreed to postpone the proceedings until January 2011.