El siguiente es mi hermano; está en la fila.

The next one is my brother; he is in line.

Breakdown of El siguiente es mi hermano; está en la fila.

• ser: to be
• en: in
• mi: my
• estar: to be

Questions & Answers about El siguiente es mi hermano; está en la fila.

Why does it start with El siguiente? What noun is being left out?

El siguiente is an adjective being used like a noun, meaning the next one / the next person. Spanish often lets you omit a noun when it’s obvious from context (like persona, chico, hermano, en la lista, etc.). So El siguiente es mi hermano is essentially (La) persona siguiente es mi hermano, but with the noun understood.

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Why is it El (masculine) and not La?

It’s masculine because it refers to a male person here (mi hermano). If you were introducing a sister, you’d say La siguiente es mi hermana.
In general:

• male / mixed / unknown → El siguiente
• female → La siguiente

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Could I say El próximo es mi hermano instead of El siguiente?

Sometimes, but El siguiente is the most natural for the next one in order (like the next person to be called). El próximo can work, but it can feel a bit more like the upcoming one. In many real contexts (a line, a list, calling turns), El siguiente is the default.

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Why is it (from ) in and not (from )?