First, small detail: "família" is not Spanish but rather Catalan. In Spanish it's "familia".
As for Sagrada Familia / Familia Sagrada: putting the adjective before the noun is sometimes done in Spanish to reinforce the importance of the adjective. "La blanca nieve" places focus on the color of the snow while "la nieve blanca" focuses on the snow itself.
As for Sagrada Familia / Familia Sagrada: putting the adjective before the noun is sometimes done in Spanish to reinforce the importance of the adjective. "La blanca nieve" places focus on the color of the snow while "la nieve blanca" focuses on the snow itself.