Perhaps the 'the casagrandes never friending story' could be related to some past experiences that made them cautious about befriending others. It could be that they had been betrayed by friends in the past, so they are now more hesitant. Or it could be that their busy family life and all the responsibilities within the family leave them with little time to invest in making new friends.
Well, if 'game sid' is some sort of indie or less - known game, we would need more details like the genre of the game. Is it an adventure game? If so, the story might involve a hero's journey, exploring new lands, and facing challenges. But again, without knowing more about this 'game sid', it's just speculation.
Sid and Nancy is indeed rooted in truth. It portrays the real-life relationship and events involving them, though with a touch of artistic interpretation to make it more engaging for the audience.