Actually, both are correct.
Eron Armweak has a brother named Eron Armweak.
Eron Armweak has a sister named Eron Armweak.
It got confusing in the end, though, and they got middle names. The female Eron Armweak's middle name is "Araia". The male Eron Armweak's middle name is "Alexis".
EDIT: page 3. Joy!