In the first promo for their TLC show, Jill and Jessa: Counting On, the Duggar sisters look back on the hard times their family has endured this year.

This will be Jill (Duggar) Dillard and Jessa (Duggar) Seewald's first return to reality television since their brother, Josh Duggar, admitted to molesting underage girls, including both sisters, when he was a teenager. Months later, it was also revealed that he had two accounts on Ashley Madison, a dating site that helps married people cheat on their spouses.

WATCH: Duggars Still Not Ready to Forgive Josh -- He Feels Like a Stranger

In the Counting On teaser, the sisters allude to their brother's scandals -- but never address it head-on.

"The whole world was shocked," Jessa says. "You have to wonder, 'How did this happen?'"

WATCH: Jessa and Jill on Josh Duggar Molestation Scandal -- 'We've All Forgiven, We've All Moved On'

Jill broke down recalling what the Duggars have been through. "You're angry and hurt and all those emotions all mixed together," she admits. "I cry a lot of tears, I still do. I know I'm hurting."

That being said, the sisters remain optimistic and are "excited for what the future holds."

WATCH: Jessa (Duggar) Seewald Shares 'Weird Yet Amazing' Video of Her Baby Bump Moving

"Definitely with all the difficulties that my family has walked through, there's still a lot of exciting milestones ahead," Jessa, who is pregnant with her first child, says. "Ben [Seewald] and I are very excited to welcome our first little one into the world very soon."

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"We will come out of this fire stronger as a family unit," Jill declares.

Jill and Jessa: Counting On will premiere on TLC this December.

MORE: 7 Important Things TLC's Breaking The Silence Revealed About Child Molestation

Prior to landing the new reality series, Jill and Jessa appeared on the TLC documentary, Breaking the Silence, which focused on sexual abuse.

The family has been slow to forgive Josh in the wake of all the revelations. In September, Jessa took a stand against her brother by sharing a Facebook post written by her father-in-law, Michael Seewald, in which he called Josh a "hypocritical Christian" after news broke of his Ashley Madison accounts.

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"It is going to take a long time before we forgive," a source told ET. "We are all still hurt. ...Nobody is warm and fuzzy to [Josh] yet. It still feels like he is a stranger."