Their father meanwhile watched the hearing from the White House dining room, where he resisted the urge to get online and comment on the events of the day.
President Trump then skipped out on watching the end of the testimony to deliver a speech to the Faith and Freedom Coalition at around 12:30pm.
Once all was said and done, Don Jr's final comment was a retweet of his father, who wrote back in April.
The rest of President Trump's children took different approaches to dealing with Comey's damning testimony, which they were given a heads up on thanks to his decision to submit his opening remarks on Wednesday afternoon.
Ivanka was spotted driving into the White House early Thursday, sitting in the back seat of her chauffeured SUV while typing away on her cell phone.
She emerged from the seldom used side exit of her home, successfully avoiding the photographers as she got into her vehicle.
Ivanka's husband Jared Kushner had no need to hide, and jolted out the front door of the home much like he does every other morning, shooting a big smile at those camped outside the $5.5million residence before hopping into his SUV.
Eric began the morning defending his charitable foundation against a story published on Tuesday, which revealed he had made large sums of money to the Trump Organization.
He took to Twitter to thank a supporter and when asked to comment on the matter told another person: "Respectfully, I have raised $16.3 Million for dying children with an expense ratio of less than 12.3%. Let's not politicise paediatric cancer."
In another tweet he declared: :Unfortunately, the only people who lose are sick kids receiving millions a year. In 2016 that was $3,600,310.00 to be exact."
Eric then emerged with a comment on the proceedings shortly after noon, retweeting a comment made by GOP chairwoman Ronna Romney McDaniel.
"Can we go back to the fact that Comey leaked memos and shared them with the media before Congress for political impact? #ComeyHearing," read the tweet.
President Trump's daughter Tiffany was completely silent meanwhile while Barron does not have social media and is busy with his mother planning their move to Washington DC later this month.
That left Don Jr to be responsible for most of the family outrage, which he continued to do throughout the hearing.
He was back again after another two minute break to keep going after Comey and his statements.
And when Senator Marco Rubio pointed out that the only thing which was never leaked was that President Trump was not under investigation, Don Jr. tweeted: "Solid point and seems rather convenient for the partisan nonsense we have seen play out for months."
That tweet even got a retweet from Don Jr 30 minutes after he first posted it on his account.
Don Jr. later added:
Then, when Comey stated that he helped to get his memo leaked in hopes of getting a special counsel to investigate, Don Jr. tweeted:
Through this all Don Jr also retweeted a number of other individuals, including former Arkansas governor Mike Huckabee, Bill O'Reilly and the disgraced host's former employer Fox News.
He also earned a number of retweets from the son of General Flynn, Michael Flynn Jr., who posted a number of Don Jr's comments to his own account.
Comey's admission that he had leaked information seemed to be the most bothersome bit of information to Don Jr. who tweeted:
Don Jr. also made a point of posting the question asked by Senator Roy Blunt of Missouri, writing:
That same question was almost asked verbatim the day prior at Bill Cosby's sexual assault trial by the Defense to his alleged victim, Andrea Constand.
