Fun fact:
Cats can't taste sweetness. (As obligate carnivores, they don't need to eat anything sweet, like fruit, so they evolved lots of taste receptors for umami, the "rich, meaty" taste of protein, as well as for saltiness, but gradually lost the receptors for sweetness.)
So Lalli is not a Blessed Feline in at least one key respect!
I imagine there weren't a lot of sweets -- or spare calories of any kind -- growing up in Keuruu. I picture life there as pretty austere and spartan: a combination of Europe immediately post-WWII, an Israeli kibbutz, and Communist China (minus the repression and Maoist cult of personality, of course).
Even if there were candy, overprotective Onni probably wouldn't let his charges eat much. Bad for their teeth, don't you know...