Boris Johnson's father told Iranian state broadcaster Press TV his son "loves Iran" and could sort out the tanker dispute "easy peasy".
Meanwhile, Boris Johnson attacked Jeremy Corbyn for appearing on Press TV today, just two days after his father's interview.
Mr Johnson Sr spoke to Press TV following his son's successful election as Prime Minister on Tuesday.
But he's been accused of making a "diplomatic gaffe" and "making policy on the spot."
He told the network his son "loves Iran," adding: "I'm very much looking forward to him building bridges with Iran."
And he said Boris had a "great sense of history" and was attracted to the region's classical past.
"Iran to him will mean Darius, Xerxes - you know, Iran means so much to him," he said. "So the chance to have longstanding relationships with a country with such a fantastic history."
Earlier today, Boris Johnson attacked Jeremy Corbyn for having appeared on Press TV in the House of Commons.
He said: "He asks about Iran, Mr Speaker. A right honourable gentleman who has been paid by Press TV of Iran.
"Who repeatedly sides with the mullahs of Tehran rather than our friends in the United States over what has been going on in Iran. How incredible that we should even think of entrusting that gentleman with the stewardship of this country's security."
In the interview, Mr Johnson Sr suggested resolving the ongoing tanker dispute would be "easy peasy" for his newly elected offspring.
"Of course you have this situation at the moment where we've got your ship which is called Stella, you've got our ship, which is called something else.
"Well, the best thing would be to say, look, we let your ship go, you let our ship go.
"Easy peasy."
Best for Britain chief executive Naomi Smith said: "This is the kind of diplomatic gaffe we've seen time and again with the Johnsons."
"It's not too long ago that a British citizen had their sentence toughened because of Boris Johnson's loose tongue. Now his dad is making policy on the spot for Iranian state TV and stomping all over a very tense international crisis.
"Having a Prime Minister like Boris Johnson will make these crises more difficult to handle anyway, let alone one with his eye taken completely off the ball by his attempts to force through a damaging no-deal Brexit ."
