Jill and Derick Dillard are beaming with joy as Baby Dilly's due date approaches.

The couple shared a photo with Derick's mother and brother on Thanksgiving that displayed Jill's growing baby bump.

"So many blessings to count this Thanksgiving," Jill posted. "Mama Cathy is well, best hubby in the world, expecting a son, God's mercies are new every morning! #happythanksgiving."

Jill's mother-in-law is a cancer survivor, and was declared cancer-free this summer.

At nearly 24 weeks, Jill has a few months left in her pregnancy, but is eager to meet her baby boy. Derick shared a sonogram of his unborn son on November 20.

"A week before Thanksgiving, I'm thankful for our baby boy!" Dillard wrote. "Awesome to think his heart has already beat [sic] about 26,784,000 times! Psalm 139:13-18."

The cited passage reads: "For you created my inmost being; you knit me together in my mother's womb. I praise you because I am fearfully and wonderfully made; your works are wonderful, I know that full well.

"My frame was not hidden from you when I was made in the secret place, when I was woven together in the depths of the earth.

"Your eyes saw my unformed body; all the days ordained for me were written in your book before one of them came to be. How precious to me are your thoughts, God!

"How vast is the sum of them! Were I to count them, they would outnumber the grains of sand—when I awake, I am still with you" (New International Version).

The Dillards have not revealed what they will name their son, but said that they are not going to do a letter theme as their parents and Jill's brother Josh did. They may, however, start a new tradition.

"We may do some kind of theme, like family names," Jill told PEOPLE last month.

Baby Dilly is due on March 24.