India, Feb. 7 -- New details have emerged in the suicide case of three minor sisters in Ghaziabad, with investigators uncovering a complex family structure and long-standing domestic and financial stressors behind the tragedy.

The three sisters, aged 16, 14 and 11, lived in a high-rise apartment with their father, a 42-year-old stock trader, and his wives. They died by suicide after jumping from the building on Wednesday.

As police began probing the case, they found that the family structure was far more complicated than initially believed. Interrogation has confirmed that the father currently has three wives - Sujata, the mother of the eldest daughter Nishika; Heena, the mother of the two younger sisters Prachi and Pakhi; and Tina. All...