She is the sister of Lauren Nakatsu. She is the half-sister of Jamie Brock and Reed Roberts.
Although Katelyn was her father's first child, she was her mother's third. Katelyn has two older half-siblings through her mother. After her parents' divorce, her parents had equal joint custody of Katelyn and her sister Lauren. Her father was in charge of education and her mother was in charge of healthcare. Both Katelyn and Lauren maintain relationships with their mother and older half-siblings. They were bridesmaids in their half-sister's wedding and attended their mother's wedding in 2019, which gave them three step-siblings, two step-brothers and one step-sister, until their divorce in 2021.
At the time of Kory and Kim's marriage, the family was Christian, albeit not involved in the IBLP or ATI. Katelyn and her siblings went to public school and participated in a relatively "normal" American childhood.
Sometime in early 2005, Katelyn's parents divorced. On August 1, 2009, Katelyn's father got remarried to Kerry Sheppard.
Katelyn went to public school through the 8th grade, until 2012. At that time, her father made the decision to pull the girls from school and begin homeschooling them. He cited their desire to be "accepted by the world" as his reasoning. She and her sister were raised as active participants of Bill Gothard's Institute in Basic Life Principles, and regularly attended the yearly Advanced Training Institute conferences in Big Sandy, Texas. She graduated on May 24, 2016.
Relationship with Jedidiah
Katelyn and Jedidiah Duggar supposedly met sometime in 2019. They chose to keep their relationship private and never made an official statement regarding their relationship until their wedding. Photos from their engagement and their wedding invitation were leaked to the public, but neither of them confirmed anything.
At the time of their engagement, Katelyn and Jedidiah made vows to each other to stay pure and avoid any physical contact or time spent alone with each other.
"Jedidiah Duggar, I receive your pledge to marry and when the Lord calls, I will be your wife. Just as the church is set apart for Christ, I am now set apart for you. I pledge myself to you, forsaking all others. And just as the Lord calls his bride, the church, to make herself ready, I pledge to make myself ready for the day that God shall bring us together as one. Until that day, I promise to redeem the time well by preparing for the high calling of being a noble wife, and, if it be the Lord's will, a godly mother someday. I pledge to you Jed to guard and strengthen my testimony of Christ and to be above reproach in my thoughts, words, and actions. That you might be honored at the city gates. As we await our lords return with patience and firm standing, I pledge to you that I will also wait patiently on the Lord and upon you."
"Katelyn Nakatsu, in the presence of God and our family and friends, I pledge to take you as my future wife. I have prepared my works without and made it fit for myself in the field and now prepare a home for us to live. Until that time, I pledge to sustain your good reputation by staying within the sight of others when we are together. I pledge to keep my way pure and honor you with my eyes, my mind, and my heart. I'll protect you by having no intimate physical contact, until that day when God allows, I will come receive you as my wife."
On April 3, 2021, Katelyn married Jedidiah Robert Duggar at Barn at the Springs in Springdale, Arkansas. The couple shared their first kiss at the altar. The wedding was officiated by Noel Cwenar. Katelyn's maid of honor was her sister Lauren. Her bridesmaids were her half-sister Jamie, Jedidiah's sisters Jinger, Johannah, and Jordyn, her friend Lydia Poteet, and four unknown friends. The flower girls were Jedidiah's nieces Meredith and Felicity. Jedidiah's best man was his twin brother Jeremiah. His groomsmen were his brothers Joseph, Josiah, Jason, James, and Justin, his brother-in-law Austin, his friend Joseph Shoemaker, and one unknown friend. The ring bearer was Jedidiah's nephew Marcus. Jedidiah's sister Jana was a pianist and Jedidiah's brothers Jeremiah and Jason were singers at the wedding. Their wedding was live-streamed on their YouTube channel.
Their honeymoon destination is unknown. Based on pictures, the couple spent time on a beach.
Katelyn volunteers in a women's prison ministry.
Katelyn received her Private Pilot's license on April 13, 2020.
Katelyn was a bridesmaid at her half-sister Jamie's wedding to Logan Brock.