Mi nieto está muy grande.
Mi nieto está muy crecido.
Eso es tu/su nieto (informal/formal)
You say, "nietos." Arguably, it means grandsons, however, in Spanish, it's how they do "grandchildren," of mixed genders.
The spanish word for grandson is el nieto.=Penguinlo.webs.com=
Mi Hijo
To say "Grandsons" in Yiddish, you would say "קיינעזעם" (keynezem).
'Grandson' = 'barnebarn'
To say 'I have a microwave' in Spanish, you would say 'Tengo una microonda.'
To say 'I have a notebook' in Spanish, you would say 'Tengo un cuaderno.'
Your brother is your grandson's great uncle, and your grandson is your borther's great nephew. Some people would also say grand nephew and grand uncle.
To say 'furniture shop' in Spanish, you would say 'muebleria.'
Nieto
The last name Nieto is of Spanish origin and means "grandson" or "descendant." It is a common surname in Spanish-speaking countries.