An ongoing police investigation into the murders of a couple and their police lieutenant son is now focused on a "family conflict over family assets".
The other son, Kittinan Homchong, is suspected of having played a role in the crime.
"It remains inconclusive as to how much he's involved but he has made a partial confession," Metropolitan Police Commissioner Lt-General Camronwit Toopgrajank said yesterday afternoon.
Camronwit denied widespread reports that the 22-year-old suspect had confessed to the killings because he wanted to inherit all his parents' massive wealth and was angry that his parents loved his brother more than him.
"The suspect has just admitted to knowing something about the crime," he said.
Camronwit said Kittinan had provided useful information and police expected to obtain court-approved arrest warrants for two suspects very soon.
He refused to say who the suspects are.
"We can't disclose details now because it may affect the ongoing investigation," he said.
He was speaking after he attended a meeting to follow up on the progress of the case.
Colonel Wichai Homchong, a 63-year-old military retiree, his wife Wanida Homchong, a 57-year-old teacher, and their eldest son Lieutenant Tammanat Homchong, a 24-year-old investigator at Taling Chan Police Station, were shot dead at their home in Bangkok's Bang Khae district on April 3.
Camronwit said police were carefully investigating to ensure justice to all sides.
"We're focusing on a family conflict over family assets as the most likely motive but we have not yet ruled out other possibilities," he said.