Moja sestra želi fotografiju sa porodicom.

Because it is in the accusative case, not the dictionary form.

• fotografija = nominative singular, the basic form
• fotografiju = accusative singular

In this sentence, želi means wants, and the thing being wanted is the direct object, so Serbian uses the accusative:

• Moja sestra želi fotografiju. = My sister wants a photograph.

This is very common with feminine nouns ending in -a:

• nominative: knjiga
• accusative: knjigu

So:

• fotografija → fotografiju

Because the preposition sa / s(a) usually requires the instrumental case when it means with.

• porodica = nominative
• porodicom = instrumental

So:

• sa porodicom = with the family

This is a very important pattern in Serbian:

• sa prijateljem = with a friend
• sa sestrom = with my sister
• sa porodicom = with the family

Moja means my.

It changes form to agree with the noun it describes. Since sestra is:

• feminine
• singular
• nominative

the possessive adjective also appears in the feminine singular nominative form:

• moj brat = my brother
• moja sestra = my sister
• moje dete = my child

So moja matches sestra.

Sestra is in the nominative singular.

That is because it is the subject of the sentence — the person doing the wanting.

• Moja sestra = my sister
• želi = wants

So the structure is:

• subject: Moja sestra
• verb: želi
• object: fotografiju
• prepositional phrase: sa porodicom

Because the subject is moja sestra = my sister, which is third person singular.

The verb želeti = to want is conjugated like this in the present tense:

• ja želim = I want
• ti želiš = you want
• on/ona/ono želi = he/she/it wants
• mi želimo = we want
• vi želite = you want
• oni/one/ona žele = they want

Since sestra = she, the correct form is želi.

Yes, here sa means with.

Serbian has both s and sa. They are basically the same preposition, but sa is often used to make pronunciation easier, especially before certain consonants or clusters.

For learners, it is safe to understand:

• sa porodicom = with the family

You may also see:

• s prijateljem
• sa sestrom

Both forms are normal, but which one is preferred often depends on pronunciation.

Usually yes: a photograph with the family or a photo including the family.

However, this phrase can sometimes feel a little broad in Serbian, just as in English. Depending on context, it could mean:

• a photo where the family is present
• a photo taken together with the family

If you specifically want to say a family photo, Serbian might also use:

• porodičnu fotografiju

So:

• fotografiju sa porodicom = a photo with the family
• porodičnu fotografiju = a family photo

Because Serbian does not have articles like English a/an/the.

So:

• fotografiju can mean a photograph or the photograph
• the exact meaning depends on context

This is normal in Serbian:

• Imam knjigu. = I have a book / I have the book
• Vidim čoveka. = I see a man / I see the man

In your sentence, English would usually translate it as a photograph, but Serbian does not need a separate word for that.

The given order is natural and neutral:

• Moja sestra želi fotografiju sa porodicom.

But Serbian word order is more flexible than English. You could change it for emphasis, for example:

• Fotografiju sa porodicom želi moja sestra.
• Moja sestra fotografiju sa porodicom želi.

These alternatives are possible, but they sound more marked or stylistically different. For a learner, the original sentence is the best neutral order:

• subject + verb + object + phrase

The letter ž is pronounced like the s in measure or the g in genre.

So:

• želi sounds roughly like ZHEH-lee

A quick pronunciation guide for the whole sentence:

• Moja = MO-ya
• sestra = SEH-stra
• želi = ZHEH-lee
• fotografiju = fo-to-GRA-fi-yu
• sa = sa
• porodicom = po-RO-di-tsom

Also, Serbian j is pronounced like English y, which is why:

• moja sounds like moya
• fotografiju has a -yu sound at the end

Yes. Serbian uses both Latin and Cyrillic scripts.

In Cyrillic, the sentence is:

Моја сестра жели фотографију са породицом.

It means exactly the same thing. Serbian speakers are generally able to read both scripts.

The dictionary forms are:

• moja → from moj = my
• sestra = sister
• želi → from želeti = to want
• fotografiju → from fotografija = photograph, photo
• sa = with
• porodicom → from porodica = family

This is useful because Serbian words often change form depending on case, number, gender, and sentence role.

Yes, porodica is the standard and very common word for family in Serbian.

In this sentence it becomes porodicom because of the instrumental case after sa.

So:

• porodica = family
• sa porodicom = with the family

That is the normal, natural choice in standard Serbian.