LONDON – Justin Trudeau has reacquainted himself with the Queen, this time as the prime minister of Canada rather than the son of Canada’s parliamentary leader.

Trudeau, making his second whirlwind tour on the international summit circuit in as many weeks, is at Buckingham Palace.

Trudeau is travelling with his wife, Sophie Gregoire-Trudeau, and two of their three youngsters, Ella-Grace and Hadrien, are along for the trip.

The Queen also met Sophie and the two youngest Trudeau children.

Afterwards, Trudeau is set to deliver a speech at Canada House in Trafalgar Square, followed by a sit-down with Prime Minister David Cameron at 10 Downing Street where it’s expected climate change, anti-terrorism measures and the Canada-European Union free trade agreement will be on the agenda.

Trudeau has a bit of history with the Queen, having met the now 89-year-old monarch as a young child in the late 1970s when his father Pierre Trudeau was Canada’s prime minister.