Children will always want to flaunt questionable language and get under the skin of adults . . . I know I sure did! Mine was picked up from my schoolmates; Alexei had numerous chances to pick up questionable language from his troup of male cousins--who, from what I've read, behaved just like you'd expect any troup of boys to behave (pardon my sexism!)--as well as from the boys sent over to play with him, plus overheard language from the sailors and so forth.
OTMA, being sheltered Grand Duchesses and perceived as such, were less likely to be exposed to this type of thing. The two eldest girls, in particular, probably heard nary a whisper of bad language for many, many years . . . not, I'm guessing, until their hospital work. On the other hand, Marie and, in particular, Anastasia, would have been more likely to hear and imitate bad language. Older children are raised according to their parents' ideals . . . by the time the younger ones come along, those ideals have become flexible! And Anastasia loved to shock people, including her more proper elder sisters.
Olga didn't know that French expletive which she underlined and then innocently asked her father about, but I would imagine that by her teenage years she'd heard a few Russian expletives. Hearing and using can be two different things, though.
