'RHSLC' 's Mary Cosby Says Her Marriage to Step-Grandfather Was 'Arranged': 'We Are Blessed'

The Real Housewives of Salt Like City premieres Wednesday on Bravo

Mary Cosby's marriage may not have been written in the stars, but it was written in legal documents.

In PEOPLE's exclusive sneak peek at Wednesday's series premiere of The Real Housewives of Salt Lake City, Mary opens up about her marriage to her late grandmother's second husband, Robert Cosby Sr.

"We were kind of a, I would say, an arranged marriage," she says. "It was kind of in my grandma's will for us to marry."

Robert says the idea for the union was sparked after his late wife said she wanted to make sure he would be taken care of after she died.

"She said, 'If anything ever happens to me, Bobby, I want you to marry one of my girls because they'll look out for you,'" he says.

Mary and Robert have been married for 21 years and share a teenage son. 

Bravo

And while Mary knows the situation is unique, she says the couple are "blessed to this day" because of the arrangement.

"They'll get over it," she says of her haters. "Just digest it."

And her husband wasn't the only thing she inherited from her grandmother.

"I am not Mormon — I'm actually Pentecostal. I am the first lady of our church," she says. "It was inherited through my grandmother. I don't like to be called a Pastor because that's like, an old lady."

Along with Mary, the newest Housewives franchise will follow the exclusive social circle of Lisa Barlow, Heather Gay, Meredith Marks, Whitney Rose  and  Jen Shah, as they navigate a society fueled by religion,  beauty, wealth and perfection.

The Real Housewives of Salt Like City premieres Wednesday at 10 p.m. ET on Bravo.