kazoku minna de ryokou no syasin wo mimasita.

In 家族みんなで, 家族 directly modifies みんな, so the two words work together as one chunk:

• 家族みんな = the whole family / everyone in the family
• 家族みんなで = with the whole family together / all together as a family

So this is not really 家族 standing alone and missing a particle. It is part of the expression 家族みんな.

You can think of it like:

• クラスみんな = everyone in the class
• 店のみんな = everyone at the shop

Japanese often lets one noun directly narrow or identify another noun like this.

みんなで means all together or everyone together.

The particle で here shows the group involved in doing the action together.

So:

• みんなで食べました = We all ate together.
• みんなで行きました = We all went together.
• 家族みんなで見ました = The whole family watched/looked at it together.

In this sentence, で does not mean location. It means something like as a group.

Yes, みんな by itself can mean everyone, but 家族みんな makes it clear which everyone:

• みんなで = everyone together
• 家族みんなで = all the family members together / the whole family together

Without 家族, the sentence would still be grammatical, but it would be less specific.

Compare:

• みんなで写真を見ました。 = We all looked at the photos.
• 家族みんなで写真を見ました。 = The whole family looked at the photos.

の connects nouns. Here it links 旅行 and 写真:

• 旅行 = trip / travel
• 写真 = photo(s)
• 旅行の写真 = trip photos / photos from the trip / photos of the trip

This の is very common in Japanese. It often works like English of, from, or a noun used before another noun.

Examples:

• 日本の映画 = Japanese movie / movie from Japan
• 友だちの車 = friend’s car
• 学校の先生 = school teacher / teacher at a school

So in this sentence, 旅行の写真 is one noun phrase: the trip photos.

を marks the direct object of the verb, meaning the thing that was looked at.

So:

• 写真を見ました = looked at the photos

The verb 見る takes an object with を:

• 映画を見る = watch a movie
• 本を見る = look at a book
• 写真を見る = look at photos

Even though English often says look at, Japanese just uses を with 見る.

The basic order is:

家族みんなで | 旅行の写真を | 見ました。

You can think of it as:

• 家族みんなで = with the whole family together
• 旅行の写真を = the trip photos
• 見ました = looked at

Japanese usually puts the verb at the end, so this is normal word order.

A rough structure is:

[who/how] [what] [verb]

Unlike English, Japanese often leaves out the subject if it is understood from context.

The subject is not stated explicitly.

Japanese often omits the subject when it is already clear from context. Depending on the situation, this could mean:

• we
• my family and I
• our family
• sometimes even they, if the conversation is about another family

Because the meaning has already been given to the learner, the important point is that Japanese does not need to say the subject if it is obvious.

If you wanted to make it explicit, you could say something like:

• 私たちは家族みんなで旅行の写真を見ました。 = We looked at the trip photos together as a family.

But very often 私たちは is omitted.

Here, 旅行 is best understood as trip.

In English, travel can sound more general, but 旅行の写真 usually means photos from a particular trip, such as a vacation or journey.

So natural translations would be:

• trip photos
• photos from our trip
• vacation photos

The exact English wording depends on context.

Yes. Japanese の is broad, so 旅行の写真 can mean:

• photos from the trip
• photos of the trip
• travel photos
• vacation photos

Japanese does not force the exact relationship as strictly as English sometimes does. Native speakers understand it naturally from context.

So if the family is looking at pictures they took while traveling, photos from the trip is a very natural interpretation.

見ました comes from 見る, which means to look at or to watch.

That is the correct choice when someone intentionally looks at something.

• 写真を見ました = looked at the photos

By contrast, 見える means to be visible or can be seen, which is different:

• 山が見えます。 = You can see the mountain. / The mountain is visible.

So here, because the family intentionally looked at the photos, 見ました is correct.

Yes.

見ました is:

• past tense
• polite form

Dictionary form:

• 見る = to look at / to see

Polite non-past:

• 見ます = look at / will look at

Polite past:

• 見ました = looked at

So the sentence is in polite past style.

No. Standard Japanese is normally written without spaces:

家族みんなで旅行の写真を見ました。

Spaces are often added in beginner materials to make the sentence easier to read. They help learners see the parts:

• 家族みんなで
• 旅行の写真を
• 見ました

But in normal Japanese writing, the spaces would usually not be there.

Usually, the sentence does not need は here.

家族みんなで already works naturally as all together as a family. Adding は changes the nuance and often creates contrast:

• 家族みんなでは旅行の写真を見ました。 = As for all of us as a family, we looked at the trip photos.
  This sounds more contrastive or context-dependent.

In ordinary narration, 家族みんなで旅行の写真を見ました。 is the natural version.

Yes, 家族で旅行の写真を見ました is also grammatical.

Difference:

• 家族で = with the family / as a family
• 家族みんなで = with the whole family together, emphasizing that everyone was included

So みんな adds emphasis to the idea that no one was left out.

Compare:

• 家族で見ました。 = We watched/looked at it as a family.
• 家族みんなで見ました。 = The whole family watched/looked at it together.

Japanese nouns usually do not change form for singular and plural.

So 写真 can mean:

• a photo
• photos

In this sentence, because 旅行の写真 often refers to a set of pictures, English will often translate it as photos, but the Japanese itself does not explicitly mark plural.

Context tells you whether it is one picture or many.