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5 Shocking Facts About Mary Cosby's Husband, Robert Cosby Sr., That RHOSLC Never Fully Explained

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The marriage of The Real Housewives of Salt Lake City star Mary Cosby and her husband, Bishop Robert C. Cosby Sr., remains one of the most talked-about and controversial relationships in reality television history. What began as a complex inheritance provision has evolved into a nearly three-decade-long union, currently facing renewed scrutiny in late 2025 following a bombshell docuseries and fresh family drama.

As of December 19, 2025, Mary Cosby has publicly maintained that her husband remains her "rock" despite the constant media and public attention surrounding their unique family structure and the Faith Temple Pentecostal Church. The latest updates, including a new TLC documentary and news regarding their son, have brought the private lives of Mary and Robert Sr. back into the harsh spotlight, forcing fans to question the true nature of their unconventional partnership.

Bishop Robert C. Cosby Sr.: A Full Biographical Profile

Robert C. Cosby Sr. is a prominent religious figure whose life became entangled with reality TV through his marriage to Mary Cosby. His background is deeply rooted in the Pentecostal faith and the establishment of a major religious institution in Salt Lake City, Utah.

  • Full Name: Robert C. Cosby Sr.
  • Primary Role: Bishop and Co-Pastor of the Faith Temple Pentecostal Church in Salt Lake City, Utah.
  • Spouse: Mary Martha Cosby (m. 1998).
  • Previous Marriage: Rosemary "Mama" Redmon Cosby (Mary's grandmother).
  • Children: Robert C. Cosby Jr. (Son with Mary Cosby).
  • Unique Relationship Detail: Robert Sr. was Mary's step-grandfather prior to their marriage. They are not related by blood.
  • Marriage Length: Approximately 27 years (as of 2025).
  • Age Gap: Approximately 20 years (Robert Sr. is older).
  • Location: Salt Lake City, Utah.
  • Inheritance: Inherited a significant portion of the church and family businesses alongside Mary following Rosemary Cosby’s death.

The Inherited Marriage and the 20-Year Age Gap

The most defining and controversial aspect of Robert and Mary Cosby's relationship is its origin. Robert Sr. was married to Mary's grandmother, Rosemary "Mama" Redmon Cosby, who was the founder of the Faith Temple Pentecostal Church and a successful businesswoman.

The Controversial Will Provision

Upon Rosemary Cosby's death, her will included a highly unusual provision: for Mary to inherit the family's vast fortune, including multiple churches, restaurants, and other businesses, she had to marry her step-grandfather, Robert Sr.

Mary has repeatedly stated that she did not want to marry him, describing the initial union as an "arranged marriage" and a necessity to secure the family legacy.

Robert Sr. was the second husband of Rosemary Cosby, making him Mary's step-grandfather. They tied the knot in 1998, a marriage that has since produced a son, Robert C. Cosby Jr.

The 20-year age gap between the two has also been a constant point of discussion and scrutiny on RHOSLC. Despite the unconventional beginning, Mary recently gave a rare update, affirming that after 27 years, she and Robert Sr. "still love each other" and he is her "rock."

The Latest 2025 Scandals: TLC Docuseries and Family Drama

The Cosby family's complex life has once again become a hot topic in late 2025, fueled by a new TLC docuseries and fresh developments concerning their immediate family.

"The Cult of the Real Housewife" Docuseries

A shocking new TLC docuseries, titled "The Cult of the Real Housewife," has put Mary, Robert Sr., and the Faith Temple Pentecostal Church back under intense scrutiny.

The documentary reportedly features former church members and family, bringing forth new and old allegations. One of the most explosive claims comes from Mary's own cousin, who alleges that Mary had an affair with Robert Sr. while he was still married to her grandmother, Rosemary.

The docuseries also reportedly touches on long-standing allegations of the church operating as a cult and claims of financial misconduct and extortion.

Son's Divorce News

In a very recent and fresh development for 2025, the Cosby family is dealing with personal drama as their son, Robert Cosby Jr., and his wife, Alexiana Smokoff, are moving forward with a divorce filing.

Robert Jr.'s relationship has been a background storyline on the show, and this official filing adds another layer of complexity to the family's public image at a time when they are already facing intense media scrutiny from the TLC documentary.

The Business Empire and Mary Cosby's Net Worth

The marriage to Robert Sr. was fundamentally tied to the inheritance of a multi-million dollar empire built by Rosemary Cosby. This legacy is the source of Mary Cosby's significant financial standing.

  • Net Worth: Mary Cosby's net worth is widely estimated to be around $5 million.
  • Source of Wealth: The fortune stems from the inherited assets, including the Faith Temple Pentecostal Church and associated businesses, as well as her salary from RHOSLC.
  • Church Headquarters: The Faith Temple Pentecostal Church is headquartered at 1510 S. Richards St., Salt Lake City, Utah.

The church and its finances have been a persistent entity in the controversies surrounding Mary and Robert Sr. The couple maintains their innocence regarding all allegations, focusing on their spiritual roles as Bishop and First Lady of the Faith Temple.

Despite the never-ending stream of scandals, the couple has managed to stay together for over a quarter of a century, a fact that Mary often points to as proof of their enduring, albeit highly unconventional, love and commitment.

mary cosby husband
mary cosby husband

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