Author's Note: Currently, I am reading The Lost Hero by Rick Riordan. Recently in the book, Jason met his sister for the first time in his life. He never knew about her before. I try to include syntactic devices in my response. Also, I would like to reduce by be-verbs by about 30% by replacing them with active verbs. I wrote this to show my opinion too.
What kind of world would it be if no one communicated? What kind of world would it be if no one knew each other? What kind of world would it be to not know their family? Of course, exceptions come in here and there for some people, but in general people know these things. Jason Grace, son of Zeus, discovered at the beginning that he had a sister, Thalia Grace. No one had ever mentioned her, and now that he is in high school he finds out.
If you have a sibling, imagine if they never existed. Then one day they show up at your door saying, "Hi, I'm your brother/sister." Jason must have had that reaction when first hearing about Thalia. The idea of a parent not telling their own children about their siblings is not an honest relationship. I don't think secrecy can be fair unless protecting someone.
Jason Grace must have gotten a lot of shock when uncovering a sister he never knew of. Why would his parents keep this away from him? A family should tell the truth when they can, and that would make the world a more understandable place.
"All truths are easy to understand once they are discovered; the point is to discover them." ~ Galileo Galilei