DENVER — The Colorado parents who reported their 6-year-old son floated away in a helium balloon in what authorities say was a hoax to drum up publicity for a TV show will both plead guilty to charges in the case, the attorney for the boy's father said today.

Richard Heene, 48, will plead guilty to attempting to influence a public servant, a felony, his attorney David Lane said. Mayumi Heene, 45, will plead guilty to false reporting to authorities, a misdemeanor.

Prosecutors have agreed to allow both to serve probation sentences, Lane said. Prosecutors did not immediately return a phone message this morning. Mayumi Heene's attorney, Lee Christian, also did not return a call.

The most serious of the charges recommended by Larimer County Sheriff Jim Alderden would have carried a maximum sentence of six years in prison.

Richard and Mayumi Heene's frantic calls to authorities Oct. 15, saying they feared their son Falcon might be aboard a homemade balloon that had escaped from their suburban Fort Collins back yard, triggered a frenzied response before the balloon landed in a dusty farm field without the boy inside. The Heenes said they found Falcon at home — hiding, they said.

Relief soon turned to suspicion. During a live interview on CNN hours after the balloon chase, Falcon looked to his father and said, "You had said that we did this for a show."