It means, "They're white".
"Es" and "son" mean "is" and "are" in Spanish.
llenar los blancos/espacios/vacios
You say "zapatos tenis blancos".
¿Te gustan los chicos blancos
they are
From Spanish to English "son todos" means 'they/you are all'.
son
my son
Oso Polar. Polar bear in Spanish is oso polar (OH-so po-LAHR).
Palos Blancos's population is 2,961.
Barros Blancos's population is 13,553.
Son los mejores