kazoku ha kanozyo wo kangeisita.

は marks the topic of the sentence.

So in 家族 は 彼女 を 歓迎した, 家族 is the thing the sentence is about: as for the family, they welcomed her.

In natural English, you usually would not translate は directly. It mainly helps organize the sentence. Here it tells you that the family is the topic, and the rest of the sentence says something about them.

を marks the direct object of the verb.

Here, 彼女 を shows that her is the person receiving the action of welcoming.

So:

• 家族 は = as for the family
• 彼女 を = her
• 歓迎した = welcomed

That is why 彼女 is understood as the one being welcomed.

Japanese normally puts the main verb at the end of the sentence.

So while English says:

• The family welcomed her

Japanese uses a pattern more like:

• The family her welcomed

This is completely normal in Japanese. A very common basic word order is:

Topic / subject + object + verb

So this sentence follows a standard Japanese pattern.

歓迎した is the past tense form of 歓迎する, which means to welcome.

• 歓迎する = welcome / to welcome
• 歓迎した = welcomed

The した part shows that the action happened in the past.

This is because 歓迎する is a suru-verb:

• noun-like base: 歓迎
• verb form: 歓迎する
• past: 歓迎した

In Japanese, words like 彼 and 彼女 can often mean either:

• he / she
• or him / her

The role is usually shown by particles, not by changing the word itself.

So here:

• 彼女 は could mean she as the topic
• 彼女 を means her as the object

Because を marks the object, 彼女 here is understood as her.

Yes, 彼女 can also mean girlfriend depending on context.

So this sentence could theoretically mean:

• The family welcomed her
• or The family welcomed his/their girlfriend

Usually, context tells you which meaning is intended. If the translation has already been given as her, then that is the intended meaning here.

This kind of ambiguity is common in Japanese.

This is a special feature of Japanese spelling.

When は is used as the topic particle, it is pronounced wa, even though the hiragana is the same character normally read as ha.

So in this sentence:

• written: は
• pronounced: wa

This is something you simply memorize for particles:

• は as a particle → wa
• へ as a particle → usually e
• を as a particle → usually o

Japanese does not have articles like a, an, or the.

So 家族 can mean things like:

• the family
• a family
• family

and 彼女 can mean:

• her
• the girl
• she, depending on context and grammar

English requires you to choose something more specific, but Japanese often leaves that information unstated unless it matters.

Yes, が is possible in some contexts, but it changes the nuance.

Compare:

• 家族 は 彼女 を 歓迎した
• 家族 が 彼女 を 歓迎した

With は, the family is the topic: you are talking about the family and saying what they did.

With が, the family is marked more as the subject in a way that can sound more specific or contrastive, like:

• The family is the one who welcomed her
• or answering a question such as Who welcomed her?

So は is a very natural choice if you are simply stating what the family did.

Grammatically, 家族 usually means family as a group. It is not marked for plural in the same way English is.

So it can refer to:

• one family as a unit
• family members collectively

In English, we often translate it as the family, even though the action may be carried out by multiple people within that family.

Japanese often leaves number less explicit than English does.

It is read:

かぞく は かのじょ を かんげいした
kazoku wa kanojo o kangei shita

Notes:

• 家族 = かぞく
• は is pronounced wa
• 彼女 = かのじょ
• を is pronounced o
• 歓迎した = かんげいした

So the full pronunciation is:

kazoku wa kanojo o kangei shita