Austin Martin Forsyth was born to Terry and Roxanne Forsyth on December 13, 1993. He was the couple's second child. When Austin was a toddler, his parents opened Fort Rock Family Camp. Along with his sister, Austin grew up homeschooled, and he often helped his parents out around the camp. As children/teens, Austin and his sister were not allowed to close their bedroom doors except to change clothes.
On June 6, 2009, Country Music Television aired an episode of the reality TV show World's Strictest Parents featuring Austin's family. In the episode, two "unruly" teenagers, 15-year-old Arielle and 17-year-old Tyler, were sent to live with the Forsyth family for a week to help them "straighten up". In the episode, the two teenagers were expected to work alongside Austin and Meagan in a variety of tasks including yardwork and household chores. They were also expected to go to White River Baptist Church with the family, an issue that Tyler argued strongly against on the grounds that he was Jewish. Both teens spoke of the Sunday school class they were forced to attend, stating that they were taught that dating lead to divorce.
On November 15, 2016, Austin announced that he was in a courtship with long-time friend Joy-Anna Duggar. The couple said that they had been friends for almost fifteen years, although Joy-Anna later said she didn't remember him as a child. Austin took Joy-Anna out to a special spot in a nearby forest to ask her to court him, and she enthusiastically said yes. This courtship proposal is featured on the Counting On episode "A Honeymoon & a Courtship".
On March 3, 2017, the couple announced that they were engaged. The couple got engaged on March 2, 2017. Austin took Joy-Anna, along with her younger sisters Johannah and Jennifer, horseback riding before leading her to a cliffside where he proposed to her. He then took her to a clearing where he and a friend had set up a table to eat a special meal he had prepared for. Joy-Anna said that she didn't expect that proposal at that moment because she didn't see any TV cameras there to film, but they were hiding in nearby trees and bushes to help make the moment more special. This proposal is featured on the Counting On episode "Joy Gets Engaged".
On May 26, 2017, Austin married Joy-Anna Duggar. The wedding took place at Cross Church in Rogers, Arkansas and had around 1,000 guests. The couple shared their first kiss at the altar. Austin had 13 groomsmen, including Joy-Anna's older brother, John-David. His sister Meagan was among the bridesmaids and his niece Allove Tunstill was the flower girl. The wedding was featured on Counting On episode "Joy's Wedding".
The couple went to Switzerland for their honeymoon, starting in Geneva and later traveling to Interlaken and Zermatt. They chose Switzerland because they thought it was beautiful. They then spent time in Israel, reportedly on a mission trip, before returning back to Arkansas.
Although they have not publicly stated where they are living, it is assumed that they have moved back to Austin's hometown of Combs, Arkansas, to work at Fort Rock Family Camp.
On August 30, 2017, Austin and Joy-Anna announced that they were expecting their first child. On February 26, 2018, Austin and Joy-Anna announced that their son, Gideon Martyn, had been born at 3:39 pm on February 23, 2018. He weighed 10 pounds and 3 ounces.
On May 1, 2019, Austin and Joy-Anna announced that they were expecting what would have been their second child, due on November 6, 2019. On June 26, 2019, at their 20-week scan, they learned that they suffered a miscarriage, and that their baby no longer had a heartbeat. Their child was a girl and they chose to name her Annabell Elise. Annabell means means "God has favored me", and Elise means "God satisfies".
On March 18, 2020, Austin and Joy-Anna announced that they were expecting their second child, a daughter. The baby was due on August 19, 2020. On August 24, 2020, Joy-Anna and Austin announced that their daughter had been born at 2:12 pm on August 21, 2020. She weighed 8 lbs., 5 oz., and measured 19 ½ inches. On August 27, 2020, they revealed her name to be Evelyn Mae.
During a 'Q&A' on Instagram Joy revealed that both she and Austin had tested positive for Covid-19 while she was pregnant with Evelyn. They experienced body aches, fever, and lost their sense of smell and taste. Both had a quick recovery.