The medical student had ended his life last month.
Police said Bhagwan Das (50), his wife Sharda (48) and their daughter Sunita (20) consumed poison at their house at Khera Dabar in Jafarpur Kalan area this morning.
"While Das and Sunita were declared brought dead by the doctors at Rao Tula Ram hospital, Sharda died while undergoing treatment at around 1.30 pm," said Dependra Pathak, Joint Commissioner of Police (south west).
Police said the family had committed suicide by consuming insecticide 'salphas' used for storing food grains.
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Pathak said Das' son, Kuldeep, who was first-year MBBS student in Russia had committed suicide on August 19 while he had come to India on a vacation.
The 23-year-old's body was found in bathroom with froth coming out of his mouth and his viscera has been sent for forensic test and the report is still awaited, he said.
Police have recovered a seven-page suicide note by Das.
He also claimed his son Kuldeep was "worried" as the duo had failed to return the money despite repeated assurances.
However, police said Kuldeep committed suicide as he was depressed over not doing well in his academics and wasting his parents hard-earned money. Besides, he was also wworried over the amount paid to the two for his admission.
"A case of abetment to suicide and cheating has been registered against Alok Sinha and Naseem and investigation is underway," Pathak said.
Police said the accused had returned Rs 12.5 lakh to Das and promised to return the balance by September 15.
The returned money was later used to send Kuldeep for MBBS studies in Russia.
The suicide note mentioned phone numbers and addresses of the accused whom the money was given for Kuldeep's admission.
Das also sought forgiveness for his act, from his parents and relatives.
He had constructed a new house and his family members including his parents and brothers were shocked that he had any financial problem which prompted him to take the extreme step.