Josiah Duggar is the latest member of the Duggar clan to enter into a courtship, according to his sister Jessa Duggar Seewald.

Jessa, 22, posted a picture of Josiah, also called "Si," and his new girlfriend Marjorie Jackson, on Instagram Monday and wrote, "Another Duggar is courting! Congrats to my bro Si and his girlfriend Marjorie!"

Fans of TLC's hit reality show "19 Kids and Counting" will be get to know Jackson and her family as the courtship is filmed for the show.

Jackson, 17, is a year younger than Duggar. Radar Online reports that she is a devoted Christian who lives with her parents, design director Greg and Spanish tutor Analucia, and four younger sisters in Springdale, Arkansas, where the Duggar family also lives. Her sisters' ages are 15, 8, 5 and 2.

Like Duggar and his 18 siblings, Jackson is also homeschooled. She is bilingual in English and Spanish thanks to her Guatemalan mother. When she was 16, she published a Bible study guide. She is also a motivational speaker. Last month, she spoke at the NWA Beautiful Girls Retreat, an annual weekend event for Christian mothers and daughters.

"Among many hobbies, Marjorie enjoys playing the piano, singing with her sister Genevieve, musical theater, art, watching black-and-white TV shows from the fifties, and talking with family, friends, strangers... pretty much anybody," her biography on the NWA Beautiful Girls website reads.

Her family has known the Duggar family for years. The couple met when Jackson's mother taught Duggar Spanish from their home. The two became friends, but Duggar decided to take the relationship a step further during an El Salvador mission trip in December, reports People.

Jackson is currently completing high school and taking college-level graphic design classes, according to the Duggar family blog.

"I really appreciate the Duggar family," Jackson told People. "I respect and admire them. I will just take this one step at a time."

Fans of "19 Kids and Counting" can see a special message from Duggar and Jackson on Tuesday's episode airing at 9 p.m. ET on TLC.