Marie's mother attended with her husband as well as Marie's father. There are a couple of pictures of her parents arriving, just one with all three standing by a table (I expect they were waiting for the arrival of the royals).
Her mother dresses in an elegant manner. Both men in regular black tie, conservative.
Prince Frederick in velvet jacket and Prince Joachim in something resembling brocade or cut velvet with a multicolored cumberbund. Personally think that J went over the top with the outfit, way too much.
Ladies were conservative, but nothing really spectacular. Marie looked demure, with a remarkable figure for just having had a child, but the style of the dress was terribly old fashioned despite the beautiful fabric. One picture showed a nice view of the back of the dress, which seemed to trail behind in a graceful way. Must admit, nice change from the purple she's been wearing to all gala events. Mary's dress also a very plain attempt at grecian style, soft coloring. Overall BLAH in my opinion.