Sestra kašlje cijelo jutro, pa joj kuham čaj od kamilice s medom.

Croatian often leaves out possessives like my when they are obvious from context.

So sestra can mean:

• sister
• my sister
• the sister

In this sentence, the natural interpretation is my sister because that is what makes sense in context.

If you want to be extra explicit, you can say moja sestra, but it is not necessary.

Kašlje is the 3rd person singular present tense of kašljati = to cough.

So:

• ja kašljem = I cough / I am coughing
• ti kašlješ = you cough / you are coughing
• on/ona kašlje = he/she coughs / is coughing

Here it means she is coughing or she has been coughing.

Croatian often uses the present tense where English uses either:

• the present continuous: is coughing
• or the present perfect continuous: has been coughing

So Sestra kašlje cijelo jutro naturally covers the idea of:

• My sister is coughing all morning
• more naturally in English: My sister has been coughing all morning

Croatian does not need a separate tense here.

Cijelo jutro means all morning.

It is in the accusative singular:

• jutro is a neuter noun
• cijelo agrees with it in gender, number, and case

This accusative is used adverbially to express duration of time.

Compare:

• cijeli dan = all day
• cijelu noć = all night
• cijelo jutro = all morning

So this is not the object of the verb; it tells you how long the coughing has been happening.

Pa is a very common conjunction in Croatian. Here it means something like:

• so
• and so
• therefore
• then

In this sentence, it links the two ideas naturally:

Sestra kašlje cijelo jutro, pa joj kuham...
= My sister has been coughing all morning, so I’m making her...

It is slightly more conversational and flowy than a more formal connector like zato or stoga.

Joj is the dative singular clitic pronoun meaning:

• to her
• for her

It is used because the person is the recipient/beneficiary of the tea.

So:

• Kuham čaj. = I’m making tea.
• Kuham joj čaj. = I’m making tea for her.

This is why you do not use a direct-object form like je or ju here.

Because joj is a clitic: a short, unstressed word that usually appears very early in the clause.

Croatian clitics often go in the second position area of the clause, so after pa it is very natural to say:

pa joj kuham čaj

That word order is standard and very common.

Croatian usually leaves out subject pronouns when they are not needed.

The verb ending already tells you who the subject is:

• kuham = I am making / I make

So ja would only be added for emphasis or contrast, for example:

• Ja joj kuham čaj, a on ništa ne radi.
  = I’m making her tea, and he’s doing nothing.

Without emphasis, just kuham is more natural.

Yes. In Croatian, kuhati is very natural for preparing things like:

• tea
• coffee
• soup

So:

• kuham čaj = I’m making tea / I’m boiling tea
• kuham kavu = I’m making coffee
• kuham juhu = I’m cooking soup

A very literal translation would sound odd in English, but in Croatian this is completely normal.

Od + genitive often means made from.

So:

• čaj od kamilice = chamomile tea
• more literally: tea made from chamomile

This is a very common Croatian pattern:

• sok od naranče = orange juice
• čaj od mente = mint tea
• džem od šljiva = plum jam

So od kamilice tells you what kind of tea it is.

Kamilice is genitive singular.

That is because the preposition od requires the genitive.

Base form:

• kamilica = chamomile

After od:

• od kamilice = from chamomile / of chamomile

The preposition s means with here, and it takes the instrumental case.

So:

• med = honey
• s medom = with honey

This phrase describes what is added to the tea.

Both s and sa mean with, but sa is mainly used when pronunciation is easier that way, especially before certain consonants or consonant clusters.

Since medom begins with m, s medom is the normal form.

You are more likely to see sa in phrases like:

• sa sestrom
• sa školom
• sa mnom

So in this sentence, s medom is exactly what you would expect.

Medom is instrumental singular.

The noun is:

• med = honey

After s meaning with, it becomes:

• s medom = with honey

So the sentence contains two useful preposition patterns:

• od + genitive → od kamilice
• s + instrumental → s medom

Not with the same meaning.

• čaj od kamilice means chamomile tea: tea made from chamomile
• čaj s kamilicom would sound more like tea with chamomile added, which is not the usual way to name that kind of tea

So čaj od kamilice is the normal expression for chamomile tea.

Because the sentence joins two clauses:

• Sestra kašlje cijelo jutro
• pa joj kuham čaj od kamilice s medom

In standard writing, a comma is commonly used before pa when it connects clauses like this.

So the comma helps show the pause and the relationship: she’s coughing all morning, so I’m making her tea.