Gracie Mansion will be bit lonelier for New York City's First Family. Dante de Blasio graduated Friday from high school, with his father - the mayor - delivering the keynote speech for Brooklyn Tech. Political reporter Josh Robin filed the following report.

Most of us learned about Dante de Blasio from the ad in which he introduced us to his father, and soon enough, the city seemed to be on a first name basis with both.

Friday, it was time to say goodbye to the teen, or at least, ‘See ya later.’ And with daughter Chiara already in college, the de Blasio nest is emptying.

"I want to speak to my fellow parents," said Mayor Bill de Blasio. "Parents, we are feeling a lot today, aren't we?"

The mayor grew nostalgic. He talked about driving Dante to school and told a secret.

"The guy who will be crossing the stage in his flip flops - that's who. Dante's flip flops have been outed," the mayor said.

De Blasio also spoke of his own teen-age searching, ultimately finding community in demonstrating against U.S. involvement in Central America.

Fast forward to recent shootings and alleged police brutality - the mayor says apathy will not cut it.

"Do not stand idly by because your talents are so great and change is needed so badly," said de Blasio. "Go out in the world and go with purpose."

The mayor and the First Lady have described themselves as proud public school parents. But now, after about two decades, that comes to an end.

For the first time since the Giuliani years, the city will not have a first family to watch.

Dante also became part of the heated debate on policing.

"If Dante wasn't your son, he'd be a candidate for a chokehold," said Reverend Al Sharpton back in July of 2014.

Everyone chatted about his hair, as his mother well knows.

"OK, this is getting out of hand. Why does Dante get all the attention - I can fro out my hair too, you know! That's like where he got his hair from," said First Lady Chirlane McCray.

Dante de Blasio is headed for Yale in the fall.

No doubt to the relief of his mom and dad, we're told there will be quality family time this summer.