Which family of instruments is seated in the back of the orchestra and why does it has to sit in back of the orchestra?

The family of instruments seated in the back of the orchestra is the brass family, which includes instruments like trumpets, trombones, tubas, and French horns. They are positioned at the back primarily due to their powerful and projecting sound, which can easily overpower other sections if placed too close to the front. This arrangement helps maintain a balanced blend of sound, allowing the more delicate strings and woodwinds in the front to be heard clearly. Additionally, the brass instruments often play more forceful and climactic passages, making their placement in the back advantageous for overall orchestral dynamics.