Η ανιψιά μου θέλει παγωτό με φράουλα, ενώ ο ανιψιός μου προτιμάει χυμό σταφυλιού.

In Greek, possessive words like μου (my) usually come after the noun:

• η ανιψιά μου = my niece
• ο ανιψιός μου = my nephew

This is completely normal Greek word order. Very literally, it is closer to the niece of mine / the nephew of mine, but in natural English we translate it as my niece and my nephew.

A very common pattern is:

• ο φίλος μου = my friend
• η μητέρα μου = my mother
• το σπίτι μου = my house

So this is something English speakers need to get used to early on.

Greek very often uses the definite article with nouns even when a possessive follows.

So:

• η ανιψιά μου literally looks like the niece my
• ο ανιψιός μου literally looks like the nephew my

But this is just standard Greek grammar. You should translate them simply as:

• my niece
• my nephew

The article agrees with the noun’s gender:

• η for many feminine nouns
• ο for many masculine nouns
• το for many neuter nouns

So the article is not optional here in normal usage.

They are the feminine and masculine forms of the same family relationship:

• η ανιψιά = niece
• ο ανιψιός = nephew

This is a very common Greek pattern: many nouns referring to people change form depending on gender.

Here, the endings help you recognize the gender:

• -ιά in ανιψιά → feminine
• -ιός in ανιψιός → masculine

So the sentence is contrasting a female relative and a male relative.

These two verbs are related, but they do not mean exactly the same thing.

• θέλει = wants
• προτιμάει = prefers

So:

• Η ανιψιά μου θέλει παγωτό... = My niece wants ice cream...
• ο ανιψιός μου προτιμάει... = my nephew prefers...

This creates a nice contrast: one person wants something, while the other prefers something else.

Also, both verbs are in the third person singular, because the subjects are singular:

• η ανιψιά μου = one person
• ο ανιψιός μου = one person

Both are used.

• προτιμάει
• προτιμά

Both mean he/she prefers.

In everyday Modern Greek, προτιμάει is very common and sounds natural.
προτιμά is also correct and often a bit more concise.

So these are both acceptable:

• Ο ανιψιός μου προτιμάει χυμό σταφυλιού.
• Ο ανιψιός μου προτιμά χυμό σταφυλιού.

A learner should recognize both forms.

Because Greek, like English, often leaves out the article when talking about something in a general or indefinite way.

So:

• θέλει παγωτό = wants ice cream
• προτιμάει χυμό σταφυλιού = prefers grape juice

This is similar to English, where we also usually say:

• She wants ice cream
• He prefers grape juice

rather than:

• She wants an ice cream
• He prefers a grape juice

Of course, Greek can use an article in other contexts, depending on meaning:

• θέλει το παγωτό = she wants the ice cream
• θέλει ένα παγωτό = she wants an ice cream

But in your sentence, the bare nouns sound natural.

Yes, literally it is with strawberry, but in context it means strawberry-flavored or with strawberry as the flavor.

So:

• παγωτό με φράουλα = strawberry ice cream

Greek often uses με (with) for flavors or ingredients:

• παγωτό με σοκολάτα = chocolate ice cream
• γιαούρτι με μέλι = yogurt with honey
• κέικ με πορτοκάλι = orange cake

So even though English may prefer strawberry ice cream, Greek expresses this very naturally with με.

Because σταφυλιού is in the genitive case. Greek often uses the genitive to mean of ....

• σταφύλι = grape
• σταφυλιού = of grape

So:

• χυμός σταφυλιού literally = juice of grape
• natural English = grape juice

This is a very common Greek structure:

• χυμός πορτοκαλιού = orange juice
• χυμός μήλου = apple juice

So when one noun describes what another noun is made from or derived from, Greek often uses the genitive.

Because χυμό is the accusative singular form, not the nominative.

The basic dictionary form is:

• ο χυμός = the juice

But after a verb like προτιμάει (prefers), the noun is the direct object, so Greek uses the accusative:

• προτιμάει χυμό = he prefers juice

This masculine noun changes like this:

• ο χυμός = nominative
• τον χυμό = accusative

In your sentence, there is no article, but the noun is still accusative:

• χυμό

The same thing happens with many masculine nouns in -ος.

Here ενώ means while, whereas, or while on the other hand.

It connects two contrasting ideas:

• Η ανιψιά μου θέλει παγωτό με φράουλα
• ενώ ο ανιψιός μου προτιμάει χυμό σταφυλιού

So the sentence is saying that the niece wants one thing, whereas the nephew prefers something else.

In this sentence, ενώ is mainly a contrast word, not a time word.

So a good translation is:

• while
• whereas

depending on style.

Greek word order is more flexible than English, because case endings and articles give extra grammatical information.

The sentence as written is very natural:

• Η ανιψιά μου θέλει παγωτό με φράουλα, ενώ ο ανιψιός μου προτιμάει χυμό σταφυλιού.

But Greek could move things around for emphasis. For example:

• Παγωτό με φράουλα θέλει η ανιψιά μου...
• Χυμό σταφυλιού προτιμάει ο ανιψιός μου...

These versions put more emphasis on the things wanted or preferred.

Still, for learners, the original order is the safest and most neutral: subject + verb + object.

The stress is important:

• ανιψιά → stress on the last syllable: a-ni-psyá
• ανιψιός → stress on the last syllable: a-ni-psyós

A few useful pronunciation notes:

• ψ sounds like ps in lips
• γι in ανιψιά is not a separate g sound; the word flows smoothly
• the accent mark shows you where the stress goes

Also:

• θέλει = THE-li
• παγωτό = pa-go-TO
• φράουλα = FRA-ou-la
• προτιμάει = pro-ti-MA-i
• σταφυλιού = sta-fi-lyOU

Even if your accent is not perfect, getting the stressed syllable right makes a big difference.

Yes, but the meaning would change slightly.

• και = and
• ενώ = while / whereas

If you said:

• Η ανιψιά μου θέλει παγωτό με φράουλα και ο ανιψιός μου προτιμάει χυμό σταφυλιού

that would simply mean:

• My niece wants strawberry ice cream and my nephew prefers grape juice

That is grammatical, but ενώ is better if you want to highlight the contrast between the two preferences.

So ενώ is more expressive here.

Yes, that is very important in Greek.

For this sentence:

• η ανιψιά = feminine
• ο ανιψιός = masculine
• το παγωτό = neuter
• η φράουλα = feminine
• ο χυμός = masculine
• το σταφύλι = neuter

Knowing the gender helps you use:

• the correct article
• the correct adjective forms
• the correct case endings

English speakers often want to memorize just the bare noun, but in Greek it is much better to learn nouns together with their article, for example:

• η ανιψιά
• ο ανιψιός
• το παγωτό
• ο χυμός

That will save you a lot of trouble later.