"A couple have died and left behind their baby and I am the one who held onto the baby and later the baby died as well," said the traumatised survivor.
"I am really sorry but there is nothing more I could do to help save the family," he said.
Stally said they only survived by eating and drinking floating coconuts and collecting rain water for drinking using a bowl that was also used for getting water out of the boat.
The stricken group were given false hope when several fishing boats passed nearby but failed to notice them as they had no flares to raise the alarm.
A fishing vessel finally spotted them on January 23 off New Caledonia. They had drifted some 2000 kilometres after more than a month at the mercy of the waves.
The Star News said the survivors comprised two men, one in his 20s, a woman and a girl aged about 12.
After a week on the fishing boat, they were dropped off in Honiara, the capital of the Solomon Islands, last Saturday. They were handed over to Papua New Guinea's High Commissioner John Balavu after receiving treatment for dehydration.
Tales of survival
The Pacific has been the scene of a string of remarkable tales of survival.
In January 2014 Salvadoran fisherman Jose Alvarenga washed up in the Marshall Islands, more than 13 months after he set off from Mexico's west coast with a companion, who died.
More than a year at sea, he covered an area of 8000km in a fibreglass boat by catching fish, birds and turtles with his bare hands and drinking rainwater, the turtles' blood, and his own urine.
His incredible story was initially greeted with scepticism, but he passed a lie detector test and an examination of ocean currents and boating records backed his claim. In 2015 he denied claims in a lawsuit filed by Alvarenga's family that he committed cannibalism by eating his crewmate to stay alive.
An Indonesian teenager survived seven weeks at sea in 2018 after his tiny fishing trap lost its moorings and ended up some 2500 kilometres away off Guam.
In 2001, Lapahele Sopi and Telea Paa from Samoa in the South Pacific survived for four months adrift at sea in a small metal boat. The pair were rescued in Papua New Guinea - 4000km from their homes.