Rose Aldridge Grainger, Percy's mother, was 52 when 1914 began.  Barbara Hershey was 51 when Passion was released. She was, therefore, almost exactly the right age to play the role. The apparent problem with the age gap was not the result of hiring a mom too young, but rather a son too old. Roxburgh was 37 when the film was made, making him too old to be Hershey's son. When 1914 dawned the real Percy had been 31, the right age to be either Barbara Hershey's son or Rose Grainger's. The fact that Hershey and Roxburgh looked close enough in age to be lovers is actually not a problem at all. In fact, it conforms to reality. Although there was no evidence to support it, the standard gossip was that the mother and son were incestuous lovers, and it was the persistence of these rumors that eventually drove Rose to commit suicide in 1922. With her characteristic flair for the melodramatic, she jumped to her death from New York's Aeolian Building.

Directly after the events pictured in the film, the Guns of August were fired and England entered into World War 1. By September, Grainger had moved permanently to the US, where he soon became a citizen, and eventually became most famous for collecting, rearranging and popularizing folk music. One of Grainger's most notable achievements was his role in turning an obscure folk ballad named Air from County Derry into one of the most widely-recognized songs in the world. (It's now universally known as Danny Boy.)

His successes were by no means restricted to the field of music. Among his diverse and eclectic accomplishments, one of the most unusual was his invention of the sports bra, but his most unusual had to be the invention of a new form of purely Anglo-Saxon English stripped of all French, Latin, and Greek influences. (He would refer to himself not as a vegetarian, for example, but as a "meat-shunner.")