haha made sono eiga wo nikai mimasita.

Here, まで does not mean until. It means something like even.

So 母まで means even my mother.

This use of まで adds a nuance of surprise, emphasis, or unexpected inclusion. It often suggests something like:

• Even my mother watched that movie twice.
• My mother, of all people, watched that movie twice.

In other contexts, まで can mean until or up to, but not in this sentence.

Because the speaker is highlighting mother as an unexpected example.

Compare:

• 母はその映画を二回見ました。
  My mother watched that movie twice.
  This is a neutral statement about your mother.

• 母がその映画を二回見ました。
  My mother watched that movie twice.
  This focuses more on who did the action.

• 母までその映画を二回見ました。
  Even my mother watched that movie twice.
  This adds the feeling that your mother is a surprising case.

So まで is not just marking the subject. It adds meaning.

In many sentences like this, yes, まで can stand where a topic/subject-related particle might otherwise appear.

So 母まで works naturally by itself.

However, it is best to think of it not as a simple replacement, but as a particle that adds the meaning even. In actual Japanese, particles like this often take the place of は or が on the surface.

The important thing for a learner is:

• 母は = neutral topic
• 母が = subject focus
• 母まで = even mother

その映画 means that movie:

• その = that
• 映画 = movie

In Japanese, demonstratives like この / その / あの come before the noun they modify.

So:

• その映画 = that movie
• not 映画その

Then を marks 映画 as the direct object of 見ました:

• その映画を見ました = watched that movie

Because 二回 is an adverbial expression of frequency: twice.

In Japanese, expressions like this often appear without a particle:

• 一回行きました = went once
• 二回見ました = watched twice
• 三回読みました = read three times

So 二回 directly modifies the verb 見ました.

A particle is not needed here.

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

So this pattern is very common:

• topic/subject
• object
• adverbial information
• verb

In this sentence:

• 母まで = even my mother
• その映画を = that movie
• 二回 = twice
• 見ました = watched

Japanese word order is more flexible than English in some ways, but the verb usually stays at the end.

Yes, somewhat.

For example, these can also be natural depending on context:

• 母まで二回その映画を見ました。
• その映画を母まで二回見ました。
  This is less natural in many contexts, but grammatically possible.

The most natural order often keeps things easy to process:

• 母までその映画を二回見ました。

Japanese allows some movement because particles show grammatical roles, but that does not mean every order sounds equally natural. The default is usually the safest choice for learners.

見ました is the polite past form of 見る (to see/watch).

So:

• 見る = dictionary form
• 見ます = polite non-past
• 見ました = polite past

Since the sentence describes a completed action, the past form is used:

• watched
• saw

If the sentence were non-past, it would be:

• 母までその映画を二回見ます。
  This would usually mean Even my mother watches that movie twice or will watch it twice, depending on context.

Japanese often uses 見る for watching movies, TV, or videos.

So:

• 映画を見る = watch a movie
• テレビを見る = watch TV

In English, see and watch are different, but Japanese 見る covers a wider range. In this sentence, the natural English translation is usually watch:

• watched that movie twice

So even though the verb literally relates to seeing, the correct English meaning here is watching.

The key nuance comes from まで.

This sentence does not just say your mother watched the movie twice. It suggests something like:

• many people watched it
• or the speaker finds it surprising
• or the mother is not the kind of person you would expect to do that

So it can feel like:

• Even my mother watched that movie twice.
• My mother even watched that movie twice.

That nuance is important. Without まで, the sentence would be much more neutral.

Not exactly.

For too/also, Japanese usually uses も:

• 母もその映画を二回見ました。
  My mother also watched that movie twice.

But まで is stronger than も. It means something closer to even.

So:

• も = also, too
• まで = even

That is why 母まで sounds more emphatic or surprising than 母も.

It is grammatical, but まで usually feels best when there is some context.

Because even my mother implies comparison or surprise, the listener often expects background such as:

• other people watched it too
• the movie became very popular
• the mother normally does not watch movies like that

So the sentence is natural, but it sounds as if part of the situation is already known.