text: A 39-year-old man allegedly impregnated his 17-year-old stepdaughter who gave birth alone at home while looking after her three-year-old sister, who then died in her care. Jondrew Lachaux, from Las Vegas, is married to the teenager's mother 38-year-old Kellie Phillips - they have six children together while the teen is from another relationship. Lachaux allegedly sexually assaulted the teenager and she had become pregnant, but she did not know, reports the Review Journal. A 39-year-old man impregnated his 17-year-old stepdaughter who gave birth alone at home while looking after her three-year-old sister, who then died in her care. Jondrew Lachaux (right) is married to the teenager's mother 38-year-old Kellie Phillips, (left) and assaulted her teen daughter . In August, Lachaux and Phillips decided to go on a road trip in California for over six months. They rented a vehicle which did not have enough space for all the family, so they left the teen and her three-year-old sister behind. Police said the pair left the teen, who can not be named, with food and medication for the three-year-old who had breathing problems. But while they were away, the teen gave birth in her mom's bed - she did not have any medical help and did not take the newborn to the hospital. The arrest report states she told police her mother was not aware that she was raped or pregnant. The teen ran out of food and began to suffer from malnutrition along with her baby and her three-year-old sister. She stopped breastfeeding after two months because she was so undernourished and switched to baby formula. It was during this period that the three-year-old died - the cause of the death is under investigation. The teen was left alone at the home in Las Vegas (pictured). She gave birth in her mom's bed - she did not have any medical help and did not take the newborn to the hospital . The teen girl said after the child died she tried to text Lachaux and her mother, but they did not respond for two weeks . The teen girl said she tried to text Lachaux and her mother, but they did not respond for two weeks, reports 8NewsNow. Police said they asked her why she did not call police and she said Lachaux told her not to call 911. She told them that when she told her stepfather that the body smelt, he allegedly told her to put her little sister in a box. She wrapped the toddler in a pink blanket and put her inside a cardboard box designed to hold a stroller. When he returned on March 28, they moved the box inside a broken car in the garage and then piled pizza boxes on top. Lachaux was allegedly desperate to hide the baby's birth from his wife before she returned and gave the teen some baby formula before kicking her and the baby out from the home . She went to a supermarket and wandered around for a few hours before walking four miles to McCarran International Airport. She spent the night there with the infant and the next day Lachaux used a fake name to book his stepdaughter a room at a motel near there - she was now only feeding the baby water because the formula had run out. Upon discovering his step-daughter had given birth, Lachaux kicked her out. She wandered the streets and the next day Lachaux used a fake name to book his stepdaughter a room at a motel (pictured) Lachaux arranged to meet her at McCarran on April 1, but airport staff called 911 when the baby began having problems, the report said. The baby was taken to Sunrise Hospital Medical Center in a critical condition and staff alerted police. The baby is now doing well in the hospital. Lachaux faces three counts of child abuse with substantial bodily harm or death, and one count of destroying or concealing evidence - bail is set at $1 million. Phillips who turned herself in after a police search, faces two counts of child abuse with substantial bodily harm or death. Her five children, aged between one and nine, are now in Child Protective Services. The 17-year-old faces one count of child abuse with substantial bodily harm or death and one count of destroying or concealing evidence. Clark County District Attorney Steve Wolfson said: 'She's a juvenile, she's 17 years old. Does she need services? Does she need treatment by the juvenile system? Or should she be punished for her actions?'
target: Jondrew Lachaux is married to the teenager's mother Kellie Phillips .
  Lachaux allegedly sexually assaulted the teen and she became pregnant .
  Parents went on road trip for months and left her to care for sister .
  She gave birth alone in her mother's bed and her little sister died .
  Lachaux told the teen she was not allowed to call 911 for help .
  Teen then hid in the body in a box under Lachaux's instruction .
  Lachaux kicked the teen out of the house and she slept at airport with baby .