They are believed to be three of Mrs Begum's six children - Saequ Khalid, 14, Saema
, 11, and nine-year-old Uzma.
Dr Chowdhury set up the medical practice in Leegomery in the mid-1980s with his wife Saema
who is also a doctor.
Sisters Saega, 14, Saema
, 11, and nine-year-old Uzma were found dead in their beds, all with multiple stab wounds.
And his three daughters, Saega, Saema
, and Uzma, were found later with their throats slit at the family home in Bristol.