The Duggars are coming back to TLC! After airing three episodes of the "19 Kids and Counting" spinoff in December, the network has announced its picking up Jill Dillard and Jessa Seewald's “Jill & Jessa: Counting On” for a full season next month. While little is known about the series, here’s six things we know so far:

1. Adoption

After touching on the idea of adopting a child on “Counting On," Jessa makes it clear in the promo video that she and her husband, Ben Seewald, want to add a second baby to their brood. “Being a mom is the most amazing thing,” Jessa, 23, says. “We’re hoping to adopt very soon!” Jessa and Ben welcomed their first baby, son Spurgeon, in November.

2. Mission Trip

Jill and her husband, Derick Dillard, have kept their fans up to date on their overseas mission trip through blog posts, but now their supporters will get to see their trip play out on screen. TLC’s synopsis for the season reveals it will showcase their mission work in Central America.

3. Jana, Jinger And Joy-Anna … And Anna

While the show will primarily follow Jill and Jessa’s lives as newlyweds and mothers, they won’t be the only female Duggars on the program. After making cameos in the first episodes of “Counting On,” Michelle and Jim Bob Duggar’s daughters Jana, 26, Jinger, 22, and Joy-Anna, 18, will also make appearances in Season 1. 

“We really were able to draw closer together,” Jessa says of her sisters in the teaser. “We’ve shared this journey with the world … Family is everything.”

The siblings’ sister-in-law, Anna Duggar, will also show. The series synopsis reveals the sisters will take a “much needed girls’ trip” with Anna, who is the wife of disgraced reality star Josh Duggar.

4. Not Just Duggar Daughters

While the female Duggars take front and center in the “Counting On” promo, it’s clear they won’t be the only family members starring on the series. Jana’s twin brother, John-David, Joseph, 21, (who is rumored to be in a courtship with a Bates family member!) and Josiah, 19, all appear in the promo. The program “follows the lives of the older children as they celebrate some of life’s milestone moments, including big moves, the realities of growing up and raising their own families,” according to the synopsis, and will also show them “continue to explore their own talents and passions.”

5. Upcoming Scenes

Before TLC announced the return of "Counting On," several Duggars were spotted out and about in Arkansas with a camera crew in January. Radar Online reports that Jana and John-David were seen with some of their younger siblings at a lumber yard near their family home. 

6. Duggar Excitement

Despite not being the stars of the TLC show, Jim Bob and Michelle released a blog post about “Counting On” coming back Tuesday. “We love being on this journey of life with each of you and look forward to the unfolding future together,” the family wrote. “We continue to pray for all of you and are excited about this new opportunity!”

Catch the premiere of “Jill & Jessa: Counting On” Tuesday, March 15, at 9 p.m. EST on TLC. Watch the promo video below: