The Keeping Up With the Kardashians alum Caitlyn Jenner's two oldest children are Burt Jenner and Cassandra Marino, and it's time to share some fascinating facts about them. Kylie Jenner recently dropped the major news that she is pregnant with her second child with Travis Scott. The news was also hinted at by Caitlyn Jenner when she revealed that her 19th grandchild was on the way. This made fans curious about Caitlyn's kids.

While some have speculated that Kylie is furious with her dad for spilling the KUWTK tea before she could, others argued that Caitlyn may have been referring to her eldest son Burt and his girlfriend Valeria Pitalo, who await a new arrival as well. The circulation of the conflicting narratives has many fans wondering who Burt is. Some Keeping Up With the Kardashians fans might have missed the memo on Caitlyn Jenner’s eldest son and his sister, Cassandra.

Related: Why Caitlyn Jenner Should Pause Governor Campaign For Celebrity Big Brother

Caitlyn had Burt and Cassandra with her first wife, Chrystie Crownover, whom she divorced in 1980, after almost a decade of marriage. Cassandra keeps an especially low profile when it comes to the media, and little is known about her outside of her microblogging website, which showcases her love of construction and home improvement. She is the mother of three children, whom she attempts to keep out of Caitlyn's pool at events. Back in 2016, she did tell People that her relationship with KUWTK's Caitlyn was improving. However, she also said, “we still have a lot of work to do.” She noted that while they did not speak for years, “now we see each other every couple of weeks and talk on the phone, which I am grateful for.” She remarked that there was a “softness” to Caitlyn that was new to her.

All About Burt

Meanwhile, Burt Jenner has a passion for dog walking and pit bull advocacy. The celeb offspring also loves race cars and his family. Burt graduated from socializing clients' dogs and cramming pups into his two-bedroom home to owning a 14,000-square foot dog boarding business. The former KUWTK guest Burt owns West LA Dogs. While looking to Caitlyn for money may have been an option, Burt was fortunate enough to finance the project with his $100,00 winnings from Octane Academy season 2. This proved he has his own reality TV chops as well. The success dates back to the old racing kart gifted to him by Caitlyn. While racing never became a full-time career for Burt, he has participated in many professional car races. He raced alongside Caitlyn in the 2014 Baja 1000 and the Lamborghini Super Trofeo series.

All About Casey

Cassandra, also known as Casey, was estranged from her father for years. She has developed a much different relationship with Caitlyn since her parent's transition. Audiences have heard extensively from KUWTK's Brody and Brandon Jenner about their own estrangements from Caitlyn. Brody's appearances on Keeping Up With the Kardashians were centered on rebuilding a relationship with Caitlyn while airing grievances about her absence from his early life. Apparently, wanting more from Caitlyn in the past isn’t the only thing that Burt, Cassandra, Brody, and Brandon agree on. Earlier this year, when Caitlyn announced her run for California Governor, Burt deleted his social accounts to "stay away from political discussion,” according to Fox News.

Caitlyn certainly seems to be in a new phase of her life, not only in terms of exploring and cementing her gender identity but also when it comes to her political ambitions and parenting. Caitlyn has an extensive and nearly royal KUWTK clan. With Cassandra attending her regular girls' nights and Burt standing by her side during her interview with Diane Sawyer, Caitlyn’s eldest children are in the mix and seem closer to their father than ever before. While there are no plans for new installments of  I Am Cait, Burt and Cassandra seem more than happy to stay out of the limelight. Fans can catch a glimpse of Burt in early Keeping Up With the Kardashians seasons, as long as they're paying close attention.

Next: KUWTK: Caitlyn Jenner's Biggest Scandals Over The Years

Sources: Fox News, People