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 / Updated  / Source: Associated Press

RIVERSIDE, Calif. — A California couple charged with torturing their children by starving, beating and shackling them faced new charges in court on Friday.

David and Louse Turpin appeared in a Riverside courtroom for a conference about their case on Friday and were charged with three additional counts of child abuse. Prosecutors also added a count of felony assault to Louise Turpin's list of charges.

The couple pleaded not guilty to torture and other charges and each is being held on $12 million bail.

The couple was arrested last month after their 17-year-old daughter escaped from the family's home in Perris, California, and called 911. Authorities said the home reeked of human waste and evidence of starvation was obvious, with the oldest sibling weighing only 82 pounds.

David Allen Turpin (L) and Louise Ann Turpin as they appear in booking photos in Riverside County, California on Jan. 15, 2018.Riverside County Sheriff's Department / Reuters

The case drew international media attention and shocked neighbors who said they rarely saw the couple's 13 children outside the home. Those who saw the children recalled them as skinny, pale and reserved.

Authorities said the abuse was so long-running the children's growth was stunted. They said the couple shackled the children to furniture as punishment and had them live a nocturnal lifestyle.

The courtroom conference is expected to focus on date-setting and other procedural issues. The district attorney's office has drafted an amended complaint but it has yet to be filed in court, officials said.

The children, who range in age from 2 to 29, were hospitalized immediately after their rescue and since then Riverside County authorities, who obtained temporary conservatorship over the adults, have declined to discuss their whereabouts or condition.

Attorneys representing the adult siblings told CBS News, however, that the seven are living at Corona Medical Center, where they have an outdoor area for sports and exercise, and are making decisions on their own for the first time.

"That in itself is a new experience for them, understanding that they do have rights and they do have a voice," attorney Jack Osborn said.

Elvis impersonator Kent Ripley performs as David and Louise Turpin pose at a chapel in Las Vegas.via Facebook

He said that making daily decisions such as what to read or wear is empowering.

"I just want you to understand just what special individuals they are," Osborn said. "They all have their own aspirations and their own interests and now they may have an opportunity to address those, which is really exciting."

The attorneys said the older siblings want to do things like go to the beach, the mountains and to movies, as well as attend college and have careers.

CBS reported that the adults communicate by Skype with the younger siblings, who are being cared for separately.

Corona Mayor Karen Spiegel, who works closely with the siblings' nurses, told CBS the nurses "talk about how warm and loving these kids are and so appreciative."