They are mentioned in the Vogue article.
The bride’s father, Neil Bush, who attended with his second wife, Maria, tweeted, “Lauren will marry David Lauren a very good man.” Prince Dimitri of Yugoslavia escorted Sharon Bush, the bride’s mother. Both parents stood under the chuppah along with their other children, Ashley and Pierce, joining Ralph and Ricky Lauren with theirs, Andrew and Dylan.
I've never had the chutzpah to stand under a chuppah!