Relatives of four family members found dead early on Sunday say foul play was not suspected.
Financial problems were very likely the motive behind the breadwinner's decision to shoot his wife, their two children and himself, an ongoing police investigation suggested.
"There's no sign of fighting or rummaging at their house and I knew that the family was in financial trouble," Saengtawan Tiwongrorakul, the dead man's uncle, said yesterday.
He showed up at Siriraj Hospital to pick up the bodies of his nephew, the latter's wife and two children.
Saengtawan said his nephew started his own business five years ago but ran into financial problems.
"In addition to borrowing money from relatives, he also mortgaged his house and with default was about to lose the property," Saengtawan said.