Mio fratello è molto goloso, quindi vuole sempre un pezzo di torta.

With singular family members in Italian, you usually do not use the article before a possessive:

• mio fratello = my brother
• mia sorella = my sister
• mio padre = my father

So mio fratello is the normal form.

You often do use the article with:

• plural family members: i miei fratelli
• family words used in special forms or with modifiers: il mio fratello maggiore, la mia sorellina

Goloso usually means someone who is very fond of tasty food, especially sweets, desserts, or treats. In this sentence, it suggests that the brother is greedy for sweets or has a sweet tooth.

So molto goloso could be understood as:

• very greedy for sweets
• very fond of desserts
• has a big sweet tooth

It agrees with the person:

• goloso = masculine singular
• golosa = feminine singular
• golosi = masculine plural
• golose = feminine plural

The accent distinguishes è = is from e = and.

• è = third person singular of essere: he/she/it is
• e = and

So here:

• Mio fratello è molto goloso = My brother is very greedy for sweets

This accent is very important in writing.

Here molto means very. It is modifying the adjective goloso.

• goloso = greedy for sweets / fond of treats
• molto goloso = very fond of sweets

So molto is being used as an adverb meaning very, not as an adjective meaning much/many.

Compare:

• molto goloso = very sweet-toothed
• molta torta = a lot of cake

Quindi means therefore, so, or as a result.

It connects the two ideas:

• Mio fratello è molto goloso = my brother has a sweet tooth
• quindi vuole sempre un pezzo di torta = so he always wants a piece of cake

It shows a logical consequence: because he loves sweets, he always wants cake.

In everyday Italian, quindi is common and natural.

In Italian, adverbs like sempre often come after the verb:

• vuole sempre = always wants

So:

• vuole sempre un pezzo di torta = he always wants a piece of cake

This is the most natural word order here.

You may also hear sempre in other positions for emphasis, but vuole sempre is the standard, neutral order.

Vuole is the third person singular of volere = to want.

The subject is mio fratello, which is he, so the verb must be he wants:

• io voglio = I want
• tu vuoi = you want
• lui/lei vuole = he/she wants

So:

• Mio fratello ... vuole = My brother ... wants

Un pezzo di torta means a piece of cake, which is more specific than just cake.

• vuole torta would sound incomplete or unnatural in standard Italian
• vuole della torta = he wants some cake
• vuole un pezzo di torta = he wants a piece of cake

So un pezzo di torta is used because the sentence is talking about one portion.

Un pezzo di torta is a fixed and very common structure meaning a piece of cake.

Here di simply links the quantity expression un pezzo to the noun:

• un pezzo di pane = a piece of bread
• un bicchiere di latte = a glass of milk
• una fetta di pizza = a slice of pizza

If you say un pezzo della torta, it means a piece of the cake, referring to a specific cake already known in the context.

So:

• un pezzo di torta = a piece of cake, in general
• un pezzo della torta = a piece of the cake, a specific one

You usually would not use sempre vuole in a neutral sentence like this. The normal order is:

• vuole sempre

Putting sempre before the verb is much less natural here and may sound marked or poetic depending on context.

For a learner, the safest pattern is:

• subject + verb + sempre + rest

So:

• Mio fratello vuole sempre un pezzo di torta

Yes. Although it is very often associated with sweets and desserts, goloso can also describe someone who is very tempted by delicious food in general.

Depending on context, it can suggest:

• a sweet tooth
• someone fond of rich or tasty food
• sometimes even someone a bit greedy about food

In this sentence, because of torta, the sweet/dessert meaning is especially clear.

You would change the words that must agree with a feminine subject:

• Mia sorella è molto golosa, quindi vuole sempre un pezzo di torta.

Changes:

• mio → mia
• fratello → sorella
• goloso → golosa

The rest stays the same because:

• è works for both masculine and feminine subjects
• vuole also stays the same

It is natural and helpful here because the sentence has two connected clauses:

• Mio fratello è molto goloso
• quindi vuole sempre un pezzo di torta

The comma makes the sentence easier to read and reflects a small pause.

In informal writing, punctuation can vary, but in a sentence like this, the comma is perfectly normal.