Jill Duggar and Derick Dillard are already parents to Israel and Samuel, and have taught their boys all about “God’s plan for sex” using a hate-filled children’s book.

It turns out that this fundamentalist take on sex education came just in time, because the Dillard family had another baby on the way.

Now, Jill has gleefully announced, the new baby has been born.

“So excited for another Dillard baby!! …” Jill wrote on Instagram beside a black-and-white photo of the newborn.

The baby, of course, is not hers.

Jill’s post continued: “Congrats @deena.dillard and @justdand.”

Those are Denna and Dan Dillard, her in-laws through her husband, Derick.

She also shared her nephew’s name, writing: “We can’t wait to meet baby Jax!”

Jill concluded her congratulatory post with the hashtags: “#firstDillardcousin #jaxonmichaeldillard”

Jax Dillard Black and White baby Pic

Jax’s mom also had some happy words to share.

“We are so excited to introduce Jaxon Michael Dillard to the world,” Deena writes on Instagram.

“He came at 9:11pm on Sept 5th,” Deena shares. “He weighs 6lbs 7oz and is 19 inches long.”

“He’s absolutely perfect in every way,” Deena gushes. Awww!

“During our skin to skin time,” Deena adds. “@justdand prayed the sweetest prayer of thanksgiving and blessing over our little family.”

“We are so grateful for God’s sweet blessing of Baby Jax,” Deena concludes.

Not content to write an Instagram post, Jill also took to her family blog to congratulate Deena and Dan.

“We are so excited for Dan and Deena (Derick’s brother and sister-in-law) on their new arrival!” Jill writes.

“Israel and Samuel are thrilled to have their first Dillard cousin,” Jill adds. “And we are so excited to have our first Dillard nephew!”

Jill reveals that they haven’t seen little Jax in person yet, but writes: “We all look forward to meeting him soon!”

“Y’all are such great parents already and we are so happy for you,” Jill writes to the new parents. “Welcome to this wonderful parenting journey!”

Jill and Derick and Deena and Dan are no strangers to congratulating each other.

“I would like to wish my sister-in-law @jillmdillard the happiest of birthdays!” Deena wrote on Jill’s birthday, back in May.

Though Derick’s bigoted attacks had gotten the couple in trouble, Deena sang Jill’s praises, writing: “She is a wonderful mother who loves Jesus so much!”

Deena even praised Jill and Derick’s missionary work, adding: “She’s even willing to raise her kiddos in the most challenging conditions in order to bring the Gospel to the nations.”

“We are blessed to know her,” Deena concluded at the time.

Derick and Jill are controversial, even compared to other Duggar family couples.

Their missionary work raised some eyebrows from fans who are concerned about their parenting — and from others who want to know why the couple is always begging fans for cash.

Derick’s transphobic attacks on fellow TLC star Jazz Jennings were not only despicable (what grown man tweets attacks on a teenage girl?), but ended the couple’s reality television career.

A lot of fans — even those who genuinely like Derick and Jill despite everything — aren’t confident that they know what they’re doing when it comes to raising children.

But it’s nice to see them celebrate a normal family milestone. They have their very first Dillard nibling! Maybe their kids will be close with Jax.