NBC News: An 11-year-old girl who was allegedly assaulted by her brother gave birth at home, and now he and their parents are facing criminal charges.

The girl gave birth to a boy in a bathtub in St. Charles, Missouri, according to a probable cause statement.

The girl’s father initially claimed the baby was his and had been dropped off on their porch by an ex-girlfriend.

But he later told investigators that his daughter had given birth to the boy and that his teenage son was the father.

Her biological brother, who is 17, was charged last week with incest, statutory rape and statutory sodomy of a person younger than 12, while her parents were charged with child endangerment. Police say the girl’s parents did not provide medical care to their daughter after she gave birth.

Police started investigating on Feb. 11 after the girl’s parents brought a baby boy to a hospital. The baby still had the umbilical cord and placenta attached and a body temperature of 90 degrees, according to a probable cause statement.

Both parents said they weren’t aware that their daughter was being raped or had become pregnant, according to charging documents.

The 17-year-old boy allegedly told police that he had had sex with his sister about 100 times. He couldn’t remember how long it had been going on for and didn’t know she was pregnant, according to charging documents.

All three suspects are being held by the St. Charles County Department of Corrections, a jail official told NBC News Friday. Bail was set at $10,000 for the woman, $100,000 cash only for the man and $300,000 cash only for the teen, according to court records.

No attorneys are listed for them in online court records.

The baby, who was born premature, remains hospitalized, and the girl is in the care of relatives, St. Charles police Lt. Tom Wilkison told NBC News.