I've multiple tables that contains different data. Some fields appear in other tables and are based on eachother. How could I allow it to be when I update area A in table A the attached area in table C instantly updates too?

Thanks ahead of time

You have to create or update the FK to Cascade the modification

FOREIGN KEY (parent_id) REFERENCES parent(id)
                      ON UPDATE CASCADE

For additional begin to see the documentation on FOREIGN KEY Constraints