Mary Cosby handled the aftermath of her son Robert Jr.’s death “so beautifully” while shooting “The Real Housewives of Salt Lake City” Season 7, according to co-star Meredith Marks. “Mary, you’ll see, her strength is so inspirational,” Marks said on the Australian radio show “Jase, Lauren & Clint”on Thursday. “And I think it will be really incredible to watch,” the Bravo star added. But Marks, 54, acknowledged “it will be very tough” for Cosby, 53, to relive the family tragedy on the upcoming season, which premieres Sept. 16. Despite that, Marks believes the reality show “gave [Cosby] another focus during a difficult time.” “That’s the…









