Rare conjoined twins from Papua New Guinea had a seven-hour operation in Australia to surgically separate them on Sunday, but only one of the boys survived.
Tom and Sawong were rushed into emergency surgery at Sydney Children's Hospital after Tom began to rapidly deteriorate.
The two-month-olds were medivacced from Port Moresby to Sydney on Thursday following medical advice that they undergo surgery as soon as possible.
A spokesperson for the family, Jurgen Ruh, said Sawong was in a stable condition and the parents were grieving the loss of his brother Tom.
"One body with two souls went into the operating theatre and, after seven hours of procedures, we had two bodies and two souls," Ruh said.
"Sadly, we lost Tom but are happy to report that we still have two souls and Sawong has survived the operation."
Ruh previously told RNZ the boys' parents had been through a "rollercoaster" of emotions since the twins were born in a remote village in Morobe province on October 9
"They have accepted that they will lose Tom (the weaker twin) and there's been many tears shed along the way," he said previously.
The twins were fused at the lower abdomen but had their own limbs and genitals, however they shared a single liver, bladder and parts of their gastrointestinal tract.
They also had spina bifida – a neural tube defect that affects the development of a newborn's spine and spinal cord.
Tom had a congenital heart defect, only one kidney and malformed lungs.
By Margot Staunton for rnz.co.nz
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