15 Shocking and Depraved Crimes Committed by Siblings

Siblings have a strange relationship with one another that no one else can really penetrate. Unfortunately, these close bonds can also lead siblings to some very dark places. History is filled with brothers and sisters that committed crimes together, and it seems none of the crimes are simple.

Every crime committed by a sibling duo has a strange energy surrounding it. In some cases, that energy is sexual; and in others, it is simply mysterious. It often seems like there’s something missing from the reports of these crimes. Maybe it’s the unknown allegiances between the killer siblings that give these stories an unhinged air. Whatever it is, brothers and sisters that kill people are disturbing and fascinating.

Most of the sibling crimes that are detailed in this collection of creepy brothers and sisters have a similar narrative arc. The stories involve fairly normal siblings who snap out of nowhere and murder their families, or people that they’ve known for years. Some of the siblings were fueled by jealously, others were definitely aided by a chemical substance, but all of these crimes committed by brothers and sisters are incredibly unsettling.

Do you and your sibling share an unnatural bond? Do you feel like no one else in the world understands what it’s like to be in your shared mental connection? Tell us about your creepy relationship with your brother or sister in the comments. 

Everyone loves a secret, but some secrets need to be more well-guarded than others. For instance, this two-decade-long marriage between a brother and sister in Austria who are going by names of "Tom" and "Lena."

Their relationship began after one of Lena's boyfriends cheated on her when she was 17. She and her brother had a heart-to-heart, and after a few glasses of wine, things progressed naturally. After 20 years, the couple have a child together, but they have to keep the nature of their relationship a secret out of fear of persecution from their friends, and Germany's strict laws regarding incest. 

In February 2016, Robert and Michael Bever went on a late-night killing spree throughout their household and stabbed their parents and one younger sibling to death as they slept. Two of their other siblings managed to survive the attack and call 911. 

The 19- and 17-year-old brothers had planned to cut up the bodies and store them in bins in the attic before taking the family vehicle along with guns and enough ammunition to randomly kill ten people in unspecified locations.

According to Detective Rhianna Russell, the brothers wanted to be mentioned alongside mass murderers like Eric Harris, Dylan Klebod, and James Holmes. 

Hasib bin Golamrabbi and Omar Golamrabbi, two brothers from Northern California, shot their parents to death before heading off to Oakland to enjoy Kraken Con where they were seen "behaving normally." (What a great plug for Kraken Con.)

The day after the slayings, family members forced their way into the Rabbi home and found a note next to one of the bodies that read, "Sorry, my first kill was clumsy," along with more writings on the walls and floor. The two brothers were arrested with two counts of murder each, though charges were later dismissed against the younger brother.

In 2014, Sabrina and Kenneth Cummins, a brother and sister from Celbridge, County Kildare, Ireland, tortured a mentally disabled man to death after committing a petty robbery. In order to cover up the slow asphyxiation of Thomas Horan, a 63-year-old man with the mental capacity of a 12-year-old, the nightmarish duo attempted to make it look like their victim had killed himself by flushing his insides with cleaning fluids.

According to court records, the two killers took a break from choking Horan to death to have a beer. 

Aren't grandparents the worst? Kenneth and Kari Allen, a brother and sister duo from Indianapolis, certainly thought so. In 2004, the Allens killed their mother, grandmother, and grandfather with a hammer before dismembering their bodies, encasing them in concrete, and burying them in their grandfather's basement. Why? So they could cash in on their grandfather's $200,000 in savings. That kind of money goes a long way in Indiana. 

Um, we're pretty sure this couldn't happen anywhere else but Oklahoma. In September of 2016, a man from Duncan, Oklahoma, came forward to offer support to his brother and sister, who were both somehow married to their mother.

Cody Spann tells a very confusing story about how his older brother married their mother; then, after that marriage was annulled, his mother married their sister, Misty. 

And don't worry about Cody, he doesn't feel left out of his mother's incestuous love triangle. When asked if she ever propositioned to him, he said, "She only tried it once and I told her to get lost, I would never be with my biological mom, that is disgusting, I came from that woman."

The Menendez Brothers are easily one of the creepiest sibling duos in recent memory. These 80s bad-guy-wannabes were so upset with their lot in life that they murdered their parents before cashing a hefty inheritance check and flashing their cash all around Los Angeles.

After their inevitable capture by the police, their team of lawyers tried to mount a defense that centered around the non-existent sexual assault they had allegedly suffered under their father, but juries saw through that and sent these Ralph Lauren rejects straight to prison. 

No one wants to meet their mom's new boyfriend, but these three teenage siblings from Fort Bend, Texas took it to the extreme when they shot their mom's boo to death after an unknown argument in 2016.

In 2005, Linda and Charlotte Mulhall got into an argument with Farah Swaleh Noor, a Kenyan immigrant whom their mother was dating and things escalated to such a fever pitch that the sisters ended up smashing in Noor's head with a hammer, cutting off his penis, and dismembering the rest of the body before throwing him in Dublin's Royal Canal. The judge presiding over the trial called the gruesome attack, "the most grotesque killing that has occurred in my professional lifetime."

It's been proven that Richard Gosling's The Notebook can cause severe emotional and sexual reactions in its viewers, and if you happen to be watching the sexy film with your brother or sister, you better be wearing your chastity belt.

Siblings from Georgia, Christopher Buckner (a woman) and Timothy Savoy were arrested for prowling, sodomy, and incest after they admitted to the police that they had sex three times in a tractor trailer parked outside of a Baptist church after watching the classic romance.