Simon Giles, 28, died in his sleep in Ghana three weeks after his daughter, Summer, was born in Aberdeen.
Mr Giles's father, Sandy, said he had "no idea" what had happened to his youngest son and the family had been forced to do their "own investigations" following his death on Sunday.
Mr Giles yesterday paid tribute to his "wonderful" son as he prepared to fly to the west African nation to recover his body.
The 60-year-old said: "We are all still in shock. The family are just devastated. He had no underlying medical conditions, but we don't even know the time of death or the circumstances.
"I was told on Monday by the police that Simon was dead, but they haven't been back in touch, so we are doing our own investigations. I just want to get some answers and find out what he died of."
Simon Giles had been working in Ghana for oilfield service company Qserv and made regular trips to the country in recent months.
His father added: "He just celebrated the birth of his second daughter three weeks ago. He was a devoted dad, who just doted on his daughters, Keira and Summer."
A spokeswoman for the Foreign Office said yesterday: "We are offering consular assistance to the family. Investigations are at an early stage.
"The authorities in Ghana have now been informed of the death. No post-mortem has been carried out as yet."
Mr Giles is survived by Keira, ten, Summer and his girlfriend Michelle.