After all what you make the character says here can show a great deal of how they interact (or not) with their family and the reader can speculate as to how they’re likely to get on with people in general and whether they’re likeable or not. Also if the character gets on well with the family, do they do this to the exclusion of getting on with anybody else? Do they look down on others?
What relationships do your characters have with each other? Do any fall foul of your world’s rules? What does your world do about it? Does your world interact with other worlds or avoid them? Are there reasons for their policy (ideally it shouldn’t just be prejudice. For example the Fairy Kingdom despites humanity for its warlike and polluting qualities. Difficult one to argue against, isn’t it? We can hardly claim not to be guilty of that).
Having good foundations for your world doesn’t just mean showing how it works and runs, important though that is, but good reasons behind their policies will make your world and stories that much more convincing. You don’t want anything to sound an odd note, anything that might interrrupt your reader’s enjoyment of your work and think “Nah! Would never work!”.
Could your world’s attitudes change (for worse or better)? Say your world is anti any kind of interaction with other species but changes it mind later as it realises it could trade (for example) with this other species for things it itself is short of, who would take on an ambassadorial role? What mistakes would your world make (potential for both comedy and tragic misunderstandings there)?