California couple accused of keeping their 13 children captive to appear in court

UPDATE: The couple was charged with dozens of charges including torture and child abuse. Read the full update here. 

A California couple accused of keeping their 13 children captive and malnourished in the family’s squalid suburban home were scheduled to make a first court appearance on Thursday.

David Turpin, 57, and his wife Louise Turpin, 49, were arrested earlier this week after their emaciated 17-year-old daughter climbed out a window of the family’s home in Perris, 113 km east of Los Angeles, and called the 911 emergency number on a cell phone.

READ MORE: 13 California siblings allegedly held captive ‘never allowed’ contact with relatives, aunt says

Police who responded to the home in an otherwise unremarkable subdivision of Perris say they found the girl’s 12 siblings, ranging in age from 2 to 29 years old, being held in “horrific” conditions, some chained to beds.

David and Louise Turpin were each charged with nine counts of torture and 10 counts of child endangerment and are being held on $9 million bail.

WATCH: Couple accused of keeping their 13 kids captive make court appearance

6:29 Couple accused of keeping their 13 kids captive make court appearance

At their initial court appearance, the couple was expected to be formally apprised of the charges against them and enter a plea.

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Before the hearing, the Riverside County District Attorney’s office will hold a news conference at 11 a.m. local time (1900 GMT).

David Turpin’s mother, Betty Turpin, told Reuters on Wednesday that the family had engaged an attorney, who advised them not to speak about the case.

Investigators this week have conducted an exhaustive search of the home, where the children also were apparently homeschooled.

WATCH: Neighbours react after police say they found children held captive by parents

0:39 ‘It’s so sad’: Neighbours react after police say they found 12 siblings held captive by parents

READ MORE: What we know about the California couple who allegedly held 13 children captive

The California Department of Education lists the Turpin address, where the family has lived since 2014, as the location of the Sandcastle Day School, with David Turpin as principal.

Experts say it may have been easier for the parents to shield their children from scrutiny because they were home-schooled.

WATCH: A dozen siblings were found trapped “in dark and foul-smelling surroundings” inside a home in Perris, Calif. on Sunday morning, police say.

0:46 California teen’s escape leads police to find her 12 siblings held captive by parents: police