Learn Italian: Il tuo fratellino è molto carino. - Your little brother is very cute.

The suffix -ino is a diminutive, meaning it makes the noun smaller or more endearing. By taking the root of fratello (brother) and adding -ino, you get fratellino, which translates to "little brother."

I learned that we drop the article for family members with possessives (like tuo fratello). Why is there an Il in Il tuo fratellino?

You remembered the rule perfectly! Normally, singular family members don't take the definite article with possessives (tuo fratello). However, there is an important exception: when the family member noun is modified by a suffix like -ino or -one, the article comes back. That is why it must be il tuo fratellino.

Does the word carino also use the -ino suffix?

Yes! Carino comes from the adjective caro (which means "dear" or "expensive") plus the diminutive suffix -ino. Over time, carino became its own very common word specifically meaning "cute" or "nice."

How would the sentence change if we were talking about a little sister instead?