Parents' disturbing behavior before son killed them and 3 siblings
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The parents of a 15-year-old who is accused of murdering them and three of his siblings are described in court documents as religious extremists who kept the family isolated.

The teenager, whose name has not been released because of a court order, is facing charges for the murders of his parents, Mark and Sarah Humiston, aged 43 and 42, and his siblings, Katheryn, 7, Joshua, 9, and Benjamin, 13.

Authorities report that the tragic incident occurred at their $1.5 million lakefront residence in Fall City, Washington, in October 2024. The family’s 11-year-old daughter was the sole survivor, having pretended to be dead before escaping to a nearby neighbor’s house.

The defense team for the teen presented his parents as abusive, claiming they exerted strict control over their children’s lives, largely isolating them due to fears regarding government and healthcare professionals.

The Humistons were extremely religious and particularly suspicious about the Covid-19 vaccine, according to court documents seen by KOMO News.

The parents educated their children at home under a ‘strict, militant survivalist ideology’ and allowed access to firearms, according to the teenager’s attorney.

Electrical engineer Mark Humiston, 43, and his registered nurse wife Sarah, 42, were found dead at the home along with three of their 5 children in October, 2024

Mark Humiston, a 43-year-old electrical engineer, and his wife Sarah, a 42-year-old registered nurse, were found deceased along with three of their five children at the residence in October 2024.

Lawyers for the 15-year-old boy (pictured) accused of killing his parents and three siblings in Fall City, Washington, claim the parents were abusive and isolated the children

Lawyers for the 15-year-old boy (pictured) accused of killing his parents and three siblings in Fall City, Washington, claim the parents were abusive and isolated the children

The teens three siblings, Benjamin, 13, Joshua, 9 and Katheryn, 7, were killed in the shooting. His 11-year-old sister survived

The teens three siblings, Benjamin, 13, Joshua, 9 and Katheryn, 7, were killed in the shooting. His 11-year-old sister survived 

Sarah Humiston’s mother allegedly told authorities that her daughter was ‘abusive and demeaning’ to the children. The grandmother told police she threatened to report her daughter if the abuse did not stop, per court filings. 

‘A common theme that has been expressed amongst extended family, neighbors, and those who knew the Humistons is that the children were isolated from the outside world and did not engage socially with many peers – only a select few families that went to their church and were friends of their family,’ the teen’s lawyers said in court documents. 

The teen’s attorneys revealed the information as they asked the court for more time to build a defense for him.

They said ‘everyone we have spoken with describe [the 15-year-old] as kind, respectful, and deeply devoted to his family.’

The attorneys said the family’s isolation has made it difficult to build a picture of that their life was like before the killings. 

Prosecutors, however, want the teen tried as an adult. 

They said the teen tried framing his younger brother Benjamin for the killings before his surviving sister revealed what had really occurred.

Police say the teen massacred his family at their $1.5million lakefront home in Fall City, Washington, on October 2024

Police say the teen massacred his family at their $1.5million lakefront home in Fall City, Washington, on October 2024

The couple were extremely religious - imposing a highly-controlled existence on their five kids which included dictating who they could be friends with and homeschooling them

The couple were extremely religious – imposing a highly-controlled existence on their five kids which included dictating who they could be friends with and homeschooling them

The teen called 911 saying his brother had shot the family dead before killing himself after being caught watching porn the previous evening, according to police. He was also accused of staging the crime scene to implicate his 13-year-old brother.

According to investigators, the 11-year-old survivor told detectives she witnessed her brother shooting family members and then checking their pulses to ensure they were dead.

Her older brother then re-entered her bedroom, where she closed her eyes and held her breath as he stood next to her bed.

She played dead before she escaping the bloodbath through a ‘fire window’ in her room and ran about a quarter of a mile away to a neighbor’s house.

In a disturbing detail, she remembered her brother leaning over the three family members he gunned down in the hallway before touching their bloodied bodies to make sure they were actually dead.

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