This post 1900 photograph features six men and six women. I gather this is either a large group of friends, brothers/sisters and spouses, or some other family grouping, such as cousins. It looks as thought the lady front-left is sitting on the man behind her, which seems really odd placement. Maybe this is a wedding party and she and the man she is sitting on are the bride and groom? Everyone has on their finery, hats, coats and furs.
No photographer information was found on the matte or back of the card.