The Republican National Convention ended on Thursday with former President Donald Trump once again accepting the GOP nomination for the third election cycle in a row.

During his lengthy acceptance speech, Trump stunned the crowd and elicited some laughter by appearing to reference his beloved youngest son, Barron, along with other family members who were there to support him, according to Newsweek.

The problem, though, is that Barron is not believed to have been in attendance at the nominating convention.

Barron unable to attend due to "prior commitments"

USA Today reported that as former President Trump accepted the GOP nomination on Thursday, he was joined on stage by his four oldest children -- Don Jr., Eric, Ivanka, and Tiffany.

Noticeably absent was his youngest and tallest son Barron, who had been selected in May to serve as a nominating delegate for the state of Florida in support of his father but ultimately declined to participate in the convention, according to a statement at the time from his mother, former first lady Melania Trump.

Her office said, "While Barron is honored to have been chosen as a delegate by the Florida Republican Party, he regretfully declines to participate due to prior commitments."

What, exactly, those "prior commitments" were, however, were never publicly revealed.

Nonetheless, during his Thursday night speech, the former president said, "I also want to thank my entire family -- Don and Kimberly, Ivanka and Jared, Eric and Lara, Tiffany and Michael," and added of his missing youngest son, "Barron, we love our Barron."

Barron attended a rally earlier this month

Yet, while Barron Trump may not have been in attendance to once again witness his father's presidential nomination, that doesn't necessarily mean that he doesn't support his father's bid for another term in the White House.

In fact, less than two weeks earlier, Fox News reported that Barron made his first public appearance at one of the former president's campaign rallies, where he received a massive ovation from the crowd of his father's supporters.

At that rally in South Florida, Trump highlighted his youngest son's attendance and said, "That’s the first time he’s done it. That’s the first time, right?"

Of the sustained applause that Barron received, the former president joked, "You’re pretty popular, he might be more popular than Don and Eric, we gotta talk about this. Hey Don, we gotta talk about this."

"So Barron, it’s good to have you. Welcome to the scene, Barron," Trump added. "He had such a nice, easy life. Now it's a little bit changed."

Barron, of course, grew up in the White House as a young boy but is now 18 and a high school graduate who is planning to attend college in the fall and, according to his father, is a "smart one" who is interested in and understands politics and even gives him advice on what he should do from time to time.