Krista and Tatiana Hogan

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Krista and Tatiana Hogan
Born (2006-10-25) October 25, 2006 (age 8)
Vancouver, Canada
Residence Vernon, British Columbia
Nationality Canadian
Parent(s) Brendan Hogan and Felicia Simms
Tatiana & Krista Facebook

Krista Hogan and Tatiana Hogan (born October 25, 2006) are Canadians who are craniopagus conjoined twins. They are joined at the top, backs, and sides of their heads. They were born in Vancouver, British Columbia, Canada, and are the only unseparated craniopagus twins currently alive in Canada.[1] They live with their mother, Felicia Simms, in Vernon, British Columbia and often travel to Vancouver for care at BC Children's Hospital and Sunny Hill Health Centre for Children.


Based on statistics, the twins were given a 20% chance of survival at birth. At birth at B.C. Women's Hospital & Health Centre, they were described as "wriggly, vigorous and very vocal."[2] They weighed twelve and a half pounds,[3] not six and a half pounds as reported by some media outlets,[4] when they were born by caesarean section.

Early infant life[edit]

Tatiana is smaller and less robust than Krista. Tests on them in April 2007 showed that Tatiana's heart was working harder than Krista's and that she had high blood pressure because of it—her heart supplies part of the blood to her brain. A surgery was planned to give her heart a "jump start" so Tatiana's would not have to work so hard.[5]

The twins' nervous systems are highly interconnected; their doctors reported that when one of them is tickled, the other jumps, and that putting a pacifier in the mouth of one could cause the other to stop crying.[5]

The twins' birth, potential separation, depth of community support and their family's financial situation have been subject to significant media coverage in Canada. They and their mother were also guests on The Tyra Banks Show in the US.

In August 2007, it was declared the twins cannot be separated, due to the likelihood of the surgery killing or paralyzing one or both girls.[1]

The family reduced the twins' public profile due to a contract giving exclusive access to a documentary crew for National Geographic and the Discovery Channel UK. The show was broadcast first in Britain in spring 2010, and then aired in June in Canada and the U.S.[6]

The documentary followed a year in the twins' life and included a "particularly poignant" meeting between the family and Lori and George Schappell, 51, the world’s oldest twins to survive being joined at the head.[7]

There is evidence[8] that the twins' can see through each other's eyes due to brain conjoining. Their thalamuses are joined.

Progression to childhood[edit]

In January 2009, a documentary was filmed which reported on the twins', and followed their progress up to their 3rd birthday. This documentary was released and aired in October, 2010. In this documentary, it was confirmed that they shared a thalamus which connected their brainstems. Through this shared brain tissue structure and the interconnected neurons one brain receives signals from the other brain and vice versa. This documentary also reported on experiments which were carried out which confirmed that visual cortex signals were received at the other brain. So in effect, one twin could "see" what the other twin was seeing, making them unique even among craniopagus twins.

At this time, Tatiana suffered from a sleep apnea condition which occasionally caused her to stop breathing for up to 20 seconds. A sleep apnea specialist, Dr. Fred Kozak, performed surgery on her and was able to successfully treat her sleep apnea. Not long after the surgery, her heart shrank to a more normal size and its rate dropped such that it no longer carried all of the burden of circulating blood for both brains.[9]

The documentary reports that the twins are progressing well, and have achieved all the normal childhood milestones, such as walking, talking, and counting.

A 2014 CBC documentary described how they can feel and taste what the other is experiencing.[10]


Their father is Brendan Hogan. Their mother is Felicia Simms. They have an older sister, Rosa, an older half-brother, Christopher, and a younger sister, Shaylee. Their grandmother, Louise McKay, is involved with raising them.

See also[edit]


  1. ^ a b "Doctors won't separate conjoined twins". 2007-08-04. Retrieved 2011-05-12. 
  2. ^ Statement from BC Women's regarding Felicia Simms delivery., News release, BC Women's Hospital & Health Centre, October 25, 2006
  3. ^ The Twins Who Share a Brain
  4. ^ "Doctors stunned by the twins who share the same brain, can hear each other's thoughts and see through each other's eyes". 2010-11-21. Retrieved 2011-12-09. 
  5. ^ a b "CTV British Columbia - Family learns B.C. twins can't be separated - CTV News, Shows and Sports - Canadian Television". 2007-08-03. Retrieved 2011-05-12. 
  6. ^ Tatiana and Krista on the move, By Ken MacQueen, Macleans. Feb. 8, 2010.
  7. ^ Today's TV, The Mirror, May 25, 2010
  8. ^ Dominus, Susan (May 25, 2011). "Could Conjoined Twins Share a Mind?". New York Times. Retrieved 19 December 2012. 
  9. ^ Twins Who Share A Brain, Doc Zone Video documentary, October 14, 2010
  10. ^ "The Hogan Sisters: How conjoined twins share body and mind". The Current, CBC. 13 March 2014. Retrieved 26 April 2014. 

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