Prince Henry, Princess Alice, Princess Marina, and Prince George at Westminster Abbey wedding

The video covers a distinguished gathering hosted by the Duchess of Gosda, where non-blue-blooded individuals are kept outside but compensated with a first glimpse of the bride, Lady Mary Hope. Lady Mary, the only daughter of the Marchioness of Linlithgow, is given away by her brother and marries Lord Herbert. The ceremony includes four bridesmaids and three pairs of children. Royal guests, including the Duchess of Kent in Parma Violet crepe and the Duchess of Gusto in dark grey chiffon, attend the event. The Duke of Kent acts as the best man.

What is the relationship of Lady Mary Hope to the Marchioness of Linlithgow?

How many bridesmaids were part of the bridal train?