But when Britney (@briterry2) came home early to celebrate Independence Day with her family, she saw her husband and her best friend’s sister in a compromising position on a Slip ‘N Slide. She agreed, but Britney told her not to tell anybody so that she could surprise them. The party went on as planned until the host of the party, another one of her best friend’s sisters, approached her. While some couples can get swept up in the excitement of the Fourth of July, this was Britney’s husband and her best friend’s sister. It was not with her best friend’s sister—the woman he was on the slide with.