Han vil hevne broren.

Because vil is a modal verb. In Norwegian, modal verbs such as vil, kan, skal, må, and bør are followed by the bare infinitive, without å.

So:

• Han vil hevne broren. = correct
• Han vil å hevne broren. = incorrect

Compare:

• Han prøver å hevne broren. = å is needed after prøver
• Han vil hevne broren. = no å after vil

It can mean either, depending on context, but in a sentence like this, learners will often understand it as wants to.

So Han vil hevne broren can mean:

• He wants to avenge his brother
• sometimes He will avenge his brother, if the context is clearly about the future

In everyday Norwegian, vil often expresses desire/intention, not just simple future. If you want a clearer future meaning, context usually does the job, or speakers may use other wording.

Hevne means to avenge.

That is different from simply taking revenge in a general sense. With hevne, the direct object is often the person or thing being avenged.

Examples:

• hevne broren = avenge the brother
• hevne farens død = avenge the father's death

A closely related expression is:

• hevne seg på noen = take revenge on someone

That is an important difference.

In this sentence, broren is the person being avenged.

So:

• Han vil hevne broren. = He wants to avenge his brother.

It does not mean that he wants revenge against his brother.

If you want to say He wants to take revenge on his brother, Norwegian would normally be:

• Han vil hevne seg på broren.

That reflexive form hevne seg på is the key difference.

Broren is the definite form of bror:

• en bror = a brother
• broren = the brother / his brother (depending on context)

In Norwegian, the definite form is often used where English uses a possessive like his if the relationship is already clear from context.

So Han vil hevne broren naturally means He wants to avenge his brother.

If you said Han vil hevne en bror, it would mean He wants to avenge a brother, which sounds much less natural unless you are speaking very generally.

It can use sin, but broren is very natural here.

Norwegian often uses the definite noun instead of an explicit possessive when the possessor is obvious from context, especially with family members and body parts.

So these are both possible:

• Han vil hevne broren.
• Han vil hevne sin bror.

But they are not always identical in feel:

• broren sounds very natural and straightforward
• sin bror can sound a bit more explicit or emphatic

Also, sin is specifically a reflexive possessive, so it refers back to the subject han.

The structure is:

• Han = subject
• vil = finite verb
• hevne = infinitive
• broren = direct object

So:

Han | vil | hevne | broren

This follows normal Norwegian main-clause word order, where the finite verb comes in the second position.

If you add something at the beginning, the verb still stays second:

• I morgen vil han hevne broren.

And with negation:

• Han vil ikke hevne broren.

Notice that ikke usually comes after the modal verb and before the main infinitive.

You would usually say:

• Han vil hevne seg på broren.

Breakdown:

• hevne seg = avenge oneself / take revenge
• på broren = on his brother

So the contrast is:

• Han vil hevne broren. = He wants to avenge his brother.
• Han vil hevne seg på broren. = He wants to take revenge on his brother.

This is probably one of the most important things to learn from this sentence.

Yes. You can also avenge an event, a loss, or a death.

For example:

• Han vil hevne farens død. = He wants to avenge his father's death.
• De ville hevne nederlaget. = They wanted to avenge the defeat.

So the object of hevne is what is being avenged, not necessarily a person.

A rough guide is:

• hevne ≈ HEV-nuh
• broren ≈ BROO-ren
• Han vil hevne broren ≈ Hahn vil HEV-nuh BROO-ren

A few useful notes:

• h in han is pronounced
• v in hevne is pronounced
• broren has two syllables: bro-ren
• the final -en in broren is the definite ending

Exact pronunciation varies a bit by dialect, but that rough guide is a good start.

Yes, it is grammatically natural, though the verb hevne is a bit dramatic and not something people use constantly in everyday conversation.

It sounds like something you might hear in:

• a story
• a film
• a crime drama
• a historical context

In more casual language, people might also say things with ta hevn:

• Han vil ta hevn for broren. = He wants to take revenge for his brother.

That is slightly different in structure, but very natural too.