Η γιαγιά μου χάρηκε πολύ όταν ήρθε ο εγγονός της από το χωριό.

In Greek, short possessive words like μου (my), σου (your), της (her), etc. usually come after the noun:

• η γιαγιά μου = my grandmother
• ο πατέρας της = her father

So η γιαγιά μου is the normal word order.

You may sometimes hear other orders in speech for emphasis, but for a learner, noun + possessive clitic is the standard pattern to remember.

They are weak possessive pronouns, and they look the same as the genitive forms of the personal pronouns.

In this sentence:

• μου = my
• της = her

So:

• η γιαγιά μου = my grandmother
• ο εγγονός της = her grandson

Greek often expresses possession by using these little genitive pronouns after the noun.

Greek normally keeps the definite article with family members and many other nouns, even when there is a possessive:

• η γιαγιά μου = literally the grandmother of me
• ο εγγονός της = literally the grandson of her

This is completely normal Greek grammar. So when translating into English, you should not try to keep the article.

Χάρηκε is the aorist of χαίρομαι (to be glad / rejoice).

Here it means something like:

• she was very happy
• she became very happy
• she was delighted

The Greek aorist usually presents an action or event as a whole, often as a single completed occurrence. In this sentence, the grandmother’s joy is viewed as a specific reaction to something that happened.

Because the sentence is talking about a completed past event: the grandson came from the village.

• έρχεται = he is coming / he comes
• ήρθε = he came

So όταν ήρθε means when he came, not when he comes.

Because the whole sentence describes past events.

• χάρηκε πολύ = she was very happy / she became very happy
• όταν ήρθε ο εγγονός της = when her grandson came

Greek often uses the aorist in both the main clause and the όταν clause when both actions are seen as completed past events.

Όταν means when.

Here it introduces a time clause:

• όταν ήρθε ο εγγονός της από το χωριό
  = when her grandson came from the village

So the structure is:

• main clause: Η γιαγιά μου χάρηκε πολύ
• time clause: όταν ήρθε ο εγγονός της από το χωριό

This is very similar to English when clauses.

Greek word order is more flexible than English word order.

In English, we usually need:

• her grandson came

But in Greek, both of these are possible:

• ο εγγονός της ήρθε
• ήρθε ο εγγονός της

In this sentence, ήρθε ο εγγονός της is very natural. Greek often places the verb before the subject, especially when introducing an event or reporting what happened.

In this sentence, the most natural interpretation is yes: her grandson means the grandmother’s grandson.

So the sentence is understood as:

• My grandmother was very happy when her grandson came from the village.

Grammatically, της could refer to another female person mentioned in a wider context, but with this sentence alone, most readers will naturally connect it to η γιαγιά μου.

Πολύ means very here.

• χάρηκε πολύ = she was very happy / she was very glad

Greek often places πολύ after the verb or adjective it modifies. So this word order is normal.

Compare:

• Χάρηκε πολύ. = She was very happy.
• Τον αγαπά πολύ. = She loves him very much.

Από means from, and το χωριό means the village.

So:

• από το χωριό = from the village

This is also a good example of a common Greek combination:

• από + το → written separately as από το

Unlike some other combinations in Greek, this one does not contract into one word.

Greek often uses the definite article where English may or may not use one.

So από το χωριό is literally from the village, but in context it may simply mean:

• from the village
• from his village
• from the countryside / from the home village

The article is natural Greek usage. English may sound less definite depending on context, but Greek commonly keeps the article with place nouns like this.

Ο εγγονός is in the nominative case because it is the subject of the verb ήρθε.

Breakdown:

• ο = nominative masculine singular article
• εγγονός = nominative masculine singular noun

So:

• ο εγγονός της = her grandson as the subject of came

By contrast, της is not nominative; it is a genitive pronoun showing possession.

The basic dictionary form is ο εγγονός (grandson), with the stress on the last syllable.

When it appears with the article:

• ο εγγονός
• τον εγγονό
• του εγγονού

the accent changes according to normal Greek accent rules in different forms.

For this sentence, you just need to recognize ο εγγονός as the nominative singular form meaning grandson.

Yes. That would also be grammatical.

Both are possible:

• όταν ήρθε ο εγγονός της από το χωριό
• όταν ο εγγονός της ήρθε από το χωριό

The version with ήρθε ο εγγονός της sounds especially natural in Greek because verb-before-subject order often fits well when narrating an event.

So this is more about word order preference and rhythm than a change in basic meaning.

It can suggest both, depending on how closely you want to match it in English.

Because it is the aorist, χάρηκε often has the sense of a definite emotional reaction:

• she was glad
• she became happy
• she was delighted

In this sentence, the idea is that her grandson’s arrival caused that feeling. So she was very happy when her grandson came is a natural translation, but the Greek also carries the sense of a specific moment of joy.