ryokousaki de totta syasin wo kazoku ni misemasita.

旅行先 means travel destination, place you traveled to, or the place where you were staying/visiting on your trip.

It is made of:

• 旅行 = travel, trip
• 先 = destination, place ahead, place one goes to

So 旅行先で means at the travel destination or while at the place I traveled to.

The particle で marks the place where an action happens.

In this sentence, the action is 撮った (took [a photo]), so:

• 旅行先で撮った写真 = the photo(s) that [I] took at the travel destination

A useful comparison:

• で = where an action happens
• に = destination, existence, specific time in some cases, indirect object, etc.

Here, because taking a photo is an action done at a location, で is the natural choice.

Because Japanese uses relative clauses before the noun they describe.

So:

• 旅行先で撮った写真 literally = [at the travel destination took] photo naturally = the photo(s) I took at the travel destination

English puts this kind of information after the noun:

• the photos that I took at the travel destination

Japanese puts it before the noun:

• 旅行先で撮った写真

This is one of the most common sentence patterns in Japanese.

Because it describes a completed action: the photos were already taken.

• 撮る = to take (a photo)
• 撮った = took

So 旅行先で撮った写真 means photos that were taken at the travel destination.

Even though 撮った is past, the whole phrase is just modifying 写真. It does not have to be the main verb of the sentence.

Japanese usually does not need a separate word like that, which, or who in relative clauses.

English:

• the photos that I took

Japanese:

• 撮った写真

The idea of that I took is built directly into the verb phrase before the noun. So Japanese often sounds more compact than English in this kind of structure.

を marks the direct object of the main verb.

The main verb is:

• 見せました = showed

So the thing being shown is:

• 旅行先で撮った写真を = the photos that [I] took at the travel destination

In other words:

• What was shown? → the photos
• To whom were they shown? → the family

Because 見せる means to show something to someone, and the person who receives the thing shown is marked by に.

So:

• 家族に見せました = showed [them] to [my] family

This pattern is very common:

• A を B に 見せる = show A to B

Examples:

• 写真を友だちに見せた = I showed the photos to my friend.
• 宿題を先生に見せた = I showed my homework to the teacher.

Yes, in this sentence 家族 naturally means my family.

Japanese often leaves out possessive words like my, your, or his/her when the meaning is obvious from context.

So:

• 家族に見せました usually means I showed [them] to my family

If needed, Japanese can say:

• 私の家族に = to my family

But in normal conversation, that is often unnecessary.

Because it is the main verb of the sentence and it is in the polite past form.

• 見せる = dictionary form
• 見せました = polite past form

This tells us the showing happened in the past and the speaker is speaking politely.

So the sentence ends with the main action:

• [I] showed the photos to [my] family

The subject is omitted, but it is naturally understood as I in most contexts.

Japanese often leaves out subjects when they are clear from context. Since the sentence says:

• photos taken on a trip
• showed them to family

the most natural interpretation is:

• I showed my family the photos I took at my travel destination.

Japanese does this very often, so learners should get used to subjects being unstated.

It can be either photo or photos.

Japanese nouns usually do not change form for singular vs. plural. The context tells you which is more natural.

So 写真 could mean:

• a photo
• photos

In this sentence, English often translates it as photos, because people commonly show multiple trip photos to family, but grammatically Japanese itself does not force singular or plural here.

Yes. A very useful way is to divide it like this:

• 旅行先で = at the travel destination
• 撮った = took
• 写真を = photos (object)
• 家族に = to [my] family
• 見せました = showed

Then combine them:

1. 旅行先で撮った写真 = the photos [I] took at the travel destination
2. 旅行先で撮った写真を家族に見せました = [I] showed my family the photos [I] took at the travel destination

This kind of chunking is very helpful for reading longer Japanese sentences.

Yes. Grammatically, Japanese does not explicitly say the subject inside that modifier unless needed.

So 旅行先で撮った写真 literally means:

• photos taken at the travel destination
• or more specifically in context, photos that I took at the travel destination

Because the whole sentence strongly suggests the speaker is the one who took them, English often translates it as the photos I took. But the Japanese phrase itself does not have to spell that out.

A good pattern to remember is:

• [place] で [verb-past] [noun] を [person] に 見せました

More abstractly:

• [relative clause] + noun + を + person に + 見せる

In this sentence:

• 旅行先で撮った = relative clause
• 写真 = noun being described
• を = object marker
• 家族に = recipient
• 見せました = main verb

This is a very common and useful structure in Japanese.