The victims were identified as Shumbhu Charan Biswas, 80, and Bijoy Kumar, 32, a fish seller by profession of Uday Naturia village under Bagulat union of the upazila.
According to the relatives and police, on Thursday afternoon a dispute erupted in the family when son Bijoy spent Tk 9,000 for the Durga Puja shopping without his father's knowledge. The father earned the money by selling a goat.
The father wanted the money back, triggering an argument with the son.
Bijoy at one stage hit his wife Minti with a bamboo stick when she tried to calm him. While trying to save the daughter-in-law the elderly man sustained injuries and fell ill.
A local doctor was called to provide treatment at home but Shumbhu passed away around 11 pm while under treatment.
Following the father’s death, Bijoy allegedly hanged himself from a nearby tamarind tree. Relatives spotted his body on Friday morning and informed police.
Both bodies were sent to Kushtia Sadar Hospital morgue around 10:30 am for post-mortem examination.
Local UP member Monirul Islam said the deaths were triggered by a family dispute.
Bijoy’s grieving younger brother Bijon Kumar said his elder brother hanged himself, reports UNB.
Officer-in-charge of Kumarkhali Police Station Khondakar Ziaur Rahman said the exact cause of death would be known after autopsies.
Preliminary information suggests a family dispute led to their deaths, he added.