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The Sister Wives family has had a great loss, as Robyn Brown is mourning the passing of her stepfather, Paul Sullivan. Even though Robyn is the least liked of the four wives due to Kody Brown favoring her, viewers are sending their condolences. This past year has featured a lot of troubles within the family, and now there is another sad event to add to the list.

TLC viewers watched as Robyn became Kody's fourth wife in 2010. She was the youngest of all of his spouses, and fans immediately noticed that Robyn often got special treatment from her husband, while the other wives were treated quite rudely. When Robyn first joined the series, she was very close to Meri. However, after Meri was forced to divorce Kody so he could marry Robyn, a lot changed. For years, Sister Wives viewers have believed that Robyn is a master manipulator and they mockingly call her, "Sobbin Robyn." She is now navigating the loss of a parent and is taking some time to mourn.

Related: Sister Wives: Paedon Speaks Out On ‘Weird’ Relationship With Robyn & Kody

Tragic news surfaced when fans learned that Sister Wives' Robyn's stepfather Paul passed away. The Sun reported that Paul passed away at the age of 80 on February 22. According to the obituary, Paul was a loving husband and father who was always willing to help others. Paul was dedicated to living on his own terms, with honor. Robyn has yet to comment on the death of her stepfather. As the obituary read, Paul was known for his integrity and his ability to bring light to others' lives.

Robyn Brown in Sister Wives

While Paul was steadfast in his beliefs, he also believed that others should live by the same moral compass. For Sister Wives fans who are curious about his cause of death, it is still unknown. Even though Robyn from Sister Wives hasn't spoken about her stepfather's passing yet, she, Kody, and their children, Dayton, Aurora, Breanna, Solomon, and Ariella Brown were all named as kin in the obituary. As TLC fans know, Robyn's birth father is Robert Marck. Paul was also a polygamist, and Robyn often referred to her stepfather Paul as her "dad" on the family show. Paul also fathered Mindy Jessop, Robyn's nanny from the recent season.

Robyn has had another questionable season, and Sister Wives viewers continue to turn on her due to her behavior. Recently, Kody and Robyn were caught taking some time out in Sedona. While they were there, they were spotted at a restaurant seemingly drinking alcohol, which goes against their beliefs. For now, Robyn is keeping to herself and mourning privately with her extended family.

Next: Sister Wives: Why Fans Think Kody & Robyn Lied About Not Drinking Booze