According to the Wiki entry, Roz McCutcheonv plays Princess Mary Adelaide. According to the IMDB, RM plays the character 'Fat Mary', who I recall seeing in the film several times. So who was she? Evidently she was part of the royal family, but I'm not sure who. The Wiki entry for Princess Mary Adelaide states that she died in 1897, so there's no way it can be her when this film starts when Prince John is very young - and he was born in 1905!
--------------------------------------- Skating and sinning...
"Fat Mary" was the nickname of Princess Mary Adelaide, Duchess of Teck, the first cousin of Queen Victoria since she was also a male-line granddaughter of King George III. She was the mother of Queen Mary, and thus Johnnie's grandmother. She was in Queen Mary's flashback to her youth. Here, Queen Mary remembered her mother's continual tardiness and the embarrassing fact that Mary Adelaide once attended her daughter's dance class by sitting on two chairs instead of one due to her bulk.
However, Mary Adelaide did die in October 1897, seven years before Johnnie's birth in 1905. Mary Adelaide actually is referenced several times in this film for some reason. Johnnie made a drawing of her, and Lalla told Georgie that it was funny he drew her correctly even though he never knew her. Also, in the scene after Johnnie dies, after Lalla knocked a plate on the floor, Queen Mary remarked that her mother often broke things too and Lalla replied, "I remember."
The references to Mary Adelaide are admittingly rather inexplicable, just like the large amount of scenes devoted to the Russian Royal Family, for they likely never affected the real Johnnie in any way.
In any case, it is a wonderful film, and naturally if it merely documented the real Johnnie's existence away from outside events, the film would perhaps not have been nearly so interesting.
"My care is like my shadow in the sun, follows me flying, flies when I pursue it..."
I was a little confused as to the segue that takes place when Queen Mary is reminiscing about her mother... I wondered what purpose the flashback played, given that it really had nothing to do with Prince John's story. In hindsight though, it makes sense to portray Queen Mary's mother to give an insight into how she chose to behave as an adult and how she expected her children to be raised; with a sense of refinement, control of emtions and strict timeliness.
The scenes with fat Mary were to explain why Queen Mary could be conceived as cold and suffered from obsessive elements in her personality. She's always obsessed with time and keeping her possessions in order- something her mother neglected.
Having said that in the DVD commentry Fat Mary comes across as someone who at least had fun and was apparently the only member of the Royals that waved to the crowds at George and Mary's wedding.
Mary Adelaide/Fat Mary/Duchess of Teck was Queen Mary's mother and a source of some embarassment to her due to her appearance and loud, vulgar personality. As a result Queen Mary worked on behaving as the exact opposite of her mother by becoming very uptight, proper, reserved. In the "The Lost Prince" I think it was to actas a snapshot as to why Mary behaved so coldly and how important proprietary was to her and why she found Prince John's problems so jarring.