In the special, the girls, along with their mother Michelle Duggar, attended a seminar held by Darkness Into Light -- an organization dedicated to the prevention of child sexual abuse -- and while none of the Duggars spoke about the molestation scandal directly, they did open up about the importance of awareness.
"I feel like this should be a discussion that people are having, even regularly," Jess said. "I think that it shouldn't be a taboo subject, and that we should be bringing awareness to child sexual abuse, and talking about this."
"It was amazing to understand that there are so many people that deal with the exact same thing in their own families, so just being educated in very good," Jill added.
The girls are two of the five Josh was said to have molested when he was a teenager. Four of them were his siblings, while the other was a family babysitter.
Jill, 24, and Jessa, 22, first discussed the scandal with Fox News host Megyn Kelly in June. They believed their story had been "warped" by the media and should have never been told. In that interview, girls reiterated the words their parents, Jim Bob and Michelle Duggar, had told Megyn days earlier, that Josh had touched them inappropriately in their sleep and they only learned of the molestation after he confessed and their parents told them.
"I look back and I think, you know, my parents did such an amazing job," Jill said at the time of how Jim Bob and Michelle handled their eldest son’s repeated confessions of inappropriate touching. "Even when we went through the DHS [Department of Human Services] investigation, they complimented my parents, on what an amazing job they did through that process and so I think not only taking the legal action that they did and then going the extra mile."
Josh's child molestation scandal first came to light in May. Three months later, the 27-year-old made headlines again after news broke that he reportedly held two accounts on Ashley Madison, the online site targeted to people seeking extramarital affairs that was hacked in August. After the leak, Josh admitted to being "unfaithful"on his wife, Anna Duggar, and being addicted to porn, though the latter was retracted from his statement.
The documentary aired just days after the former lobbyist entered a long-term rehab facility on "a long journey toward wholeness and recovery," according to the Duggar family.
Following the Ashley Madison scandal that led to Josh's admission, both Jill and Jessa have taken to Twitter, but only to post Bible passages and church sermons. Interestingly, last week Jill retweeted an update from Ronnie Floyd -- a Senior Pastor at the Duggar family's church in Springdale, Arkansas -- on the congregation's sermon series, Sex Today, which sees "what God's Word says about human sexuality."
The next day, Jessa tweeted a Bible passage called "Walk in the Light," which reads, "If we say we have fellowship with him while we walk in darkness, we lie and do not practice the truth." Many are speculating that this references Josh's most recent troubles.
The reality show that made the Duggar family famous, 19 Kids and Counting, was cancelled by TLC in July.
Two family members recently spoke to ET about Josh's admission to rehab. Find out more from the relatives, who say their "all shocked and broken and furious," in the video below.