The parents of a 15-year-old California girl have been arrested on hate crime charges after allegedly assaulting, kidnapping and threatening with racial slurs a teenage boy they found in their teen girl's bedroom.

San Bruno Police said that the girl's biological father, Luisandor Suarez, 49, of San Francisco, her mother, Haydee Arguello, 46, and stepfather, Wilfredo Amaya, 46, both of San Bruno, California, assaulted and threatened to kill the 17-year-old boy.

The incident allegedly happened on Thursday at 2.30am, lasted for 30 minutes and involved a deadly weapon, according to ABC 7.

Luisandor Suarez, 49 (left), Haydee Arguello, 46 (center), and stepfather, Wilfredo Amaya, 46,(right) face charges including committing a hate crime, kidnapping and assault

The three were arrested after they allegedly assaulted, threatened and kidnapped a 17-year-old black boy that was found inside their 15-year-old daughter's bedroom (pictured) early Thursday morning. Suarez and Arguello are her birth parents, Amaya is her stepfather

'These family members ultimately restrained the victim using a rope. Held him against his will, assaulted him multiple times and even threatened to kill him,' San Bruno Police Department Lieutenant Ryan Johansen said in a Facebook post.

Police said the teen boy was then released and he ran away from the home. He was then treated at a local hospital for non-life threatening injuries.

The incident is being investigated as a possible hate crime because the boy reported that Suarez, Arguello and Amaya 'yelled at him using multiple racial slurs and he believed his race to be a motivating factor in the attack,' Johansen said.

The teen boy is African-American and the girl's family is of Hispanic descent.

The teen girl's older sisters dispute the claims that their parents attacked the boy for racial reasons and claimed that the incident was actually an issue of self defense.

The teen's older sisters said that Arugello (left) and Amaya (right) were acting in self defense and had been surprised to find the boy in the teen girl's room

Suarez is said to have arrived at the teen girl's home shortly after the teen boy was found

The teen's sisters, Belkys Gomez (left) and Katherine Gomez (right), denied claims that the three parents involved in the incident hurt the teen boy and the incident was a hate crime

'They were so scared because they found someone in the closet,' Belkys Gomez told ABC 7. 'They jumped because everyone was sleeping and this guy started kicking my step-father and trying to kill him.'

Katherine Gomez, meanwhile, said that the teen boy punched her mother, Arguello and that her stepfather, Amaya, 'of course, is not going to let anyone hit his wife.'

Katherine said that her parents then 'tried to stop him and he was acting very violent so they grabbed a rope to try to tie him down and ask him why he was at the house.'

The sisters said that their parents did not hurt the teen boy and that the hate crime accusations are 'not true at all.'

A neighbor told the news station that they heard a boy screaming in pain at the time the incident occurred.

Johansen told the San Francisco Chronicle that both teens 'physically, I think they will be perfectly fine' but noted that 'emotionally, I think there are a lot of scars.'

Suarez, Arguello and Amaya were arrested and charged with committing a hate crime, kidnapping, assault with a deadly weapon and criminal threats on Friday.

Their 15-year-old daughter is now in the custody of Child Protective Services.