Ahmad Seth has spoken out over the disappearance of his 53-year-old father, along with 239 passengers who were en route to Beijing from Kuala Lumpa 19 days ago.
And the captain's youngest son has also admitted his family have yet to accept the ruling that everyone on board the plane is dead, insisting he will wait for evidence.
"I've read everything online, but I've ignored the speculation.
"We may not be as close as he travels so much. But I still understand him.
"Now we are just waiting for the right confirmation. I'll believe it when I see the proof in front of my eyes."
The theory of mechanical failure or hijacking has largely been dismissed, with the spotlight now falling on Captain Zaharie.
A friend close to the pilot- who wished to remain anonymous- yesterday revealed that the captain was in 'no right mind to be flying', having been left distraught by his wife's recent move out of their marital home.
"He's one of the finest pilots around and I'm no medical expert, but with all that was happening in his life Zaharie was probably in no state of mind to be flying," he told a New Zealand paper.
Revealing that the pilot's friendships had been 'breaking down', he added that it is possible Zaharie took the plane 'for one last joyride'.
A fourth set of satellite images have now emerged, showing potential debris in the Indian Ocean, roughly 2500km south west of Perth.