How were the twins delivered? Hard to imagine squeezing two fused heads through vaginal birth, so for the sake of the mother I hope it was C-section. Before "modern medicine" mother and head-fused twins would like just all die during attempt at childbirth and you would not need "modern medicine" to surgically separate the twins later.
"What monsters would separate two sisters?!"
Oh, that's who ...
... the operation was arranged by a charity called Gemini Untwined, which specializes in treating and researching craniopagus twins — children born with fused skulls, intertwined brains, and shared blood vessels. The founder of the charity, British paediatric neurosurgeon Dr. Owase Jeelani, led the operation that successfully separated Minal and Mirha.