@Joonas: Some Parisians regard themselves as "Parisian", not French; or, French is a secondary thing. Hence Parisians have a reputation for being haughty. Outside of Paris working-class French people were great (hitch-hiking days) sharing food with us, laughing about the England football-team losing again. It's the aspirants who are the problem--the "ten-bob millionaires"; or, as Newcastle people would say, "the nowts" = "the nothings" ("ow" as in "cow").

@Joonas: The ten-shilling ("ten bob") note was an old unit of currency (approx. 50-cents) withdrawn in 1969. But the phrase is still used--"ten-bob millionaire"--those who put on airs-and-graces; think they're important when not; self-styled superior beings.

Could laetus sum si laetus es mean I am happy if you are happy?

@JohhanSantana In this case, yes, though do be careful with conditionals. Latin and English construct them differently.

dcc.dickinson.edu/grammar/latin/classification-conditions

@cmw ok! Thank you

@cmw Could someone read that as if I am happy, you are happy?

@Adam No, because the si goes before the clause, not after it.

@JohhanSantana Also note that these are masculine both, if that matters.