Tutti e due i fratelli sono inseparabili e la loro somiglianza è un riflesso.

Questions & Answers about Tutti e due i fratelli sono inseparabili e la loro somiglianza è un riflesso.

Why do we need the article i in tutti e due i fratelli?
In Italian, when you use tutti e due (literally all and two) before a noun, you must include the definite article. You are essentially saying all and two the brothers.
If I wanted to use entrambi instead, how would the sentence change?
It would simply become entrambi i fratelli. Just like tutti e due, the word entrambi requires the definite article before the noun. Both expressions mean exactly the same thing and can be used interchangeably here.
Why is there a la in la loro somiglianza? Doesn't loro already mean their?
Italian possessive adjectives like loro almost always need a definite article before them. The article is only dropped for singular close family members (like mio padre), but somiglianza is a regular noun. Also, as a quick refresher, the word loro is a special exception that always keeps its article, even with family members!
Why does the adjective inseparabili end in -i?
The dictionary form of this adjective is inseparabile, ending in -e. Adjectives that end in -e in the singular change their ending to -i in the plural for both masculine and feminine nouns. Since it describes the plural masculine i fratelli, it must be inseparabili.

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