I don't think this really matters, but does Norwegian use the Oxford comma?
I'm trying to be polite, & working from what I remember my grandparents teaching me too many decades ago. So yes, my Norwegian probably sounds like your Gammel bestemor.
skall = shell/peel :)
If you were trying to be polite and use the polite pronoun 'De', the 'D' should be capitalized, otherwise it just means 'they'(de). And there's no need to be overly polite, it isn't natural in modern Norwegian. In fact, nobody would use 'De' anymore, unless it's a very formal situation.
I gamle dager, og noen ganger nå til dags, sier/sa folk "de" eller "dem" så det er rett, men litt mer formelt en "du"