FRATELLO, the Italian word for brother. It comes from Late Latin fratellus, a diminutive of frater. It is related to the Sanskrit bhrātar, which in turn comes from the Indo European root bher-, meaning "to carry", "to support", or "to nourish." So, etymologically speaking, a fratello is someone who supports us, nourishes us, and walks through life with us. I mean, wow. Fratellone means big brother, thanks to the suffix -one, which we can add to almost any noun to make it bigger or more emphatic. Fratellino means little brother, thanks to the suffix -ino, one of the most common diminutive endings in Italian. Then we have fratellastro, meaning stepbrother. This word opens an interesting window into Italian. Historically, the suffix -astro often gave words a negative or less favorable nuance. Today, however, fratellastro is simply the normal word for stepbrother, and most people don't think of it as insulting. Fratelli d'Italia, the Italian national anthem. Just like in English, we also use fratello for people who aren't actually our brothers, just like saying "bro." You'll hear expressions like: "Ciao, frà!" "Ciao, fratè!" Or, in parts of Umbria, even frego. SORELLA comes from the Latin soror, with the diminutive ending -ella, created by analogy with fratello. Just like fratello, we also have: Sorellina – little sister Sorellona – big sister Sorellastra – stepsister And it's worth noticing that sorella shares the same root as the English word sorority, for obvious reasons.