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Consider the following two sentences:

> うちへ **帰って来ます** 。
>
> うちへ **帰ります** 。

What's the difference between these two sentences? How does the bolded part
affect the meaning?
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word-choice meaning verbs subsidiary-verbs
Difference between 帰って来る and 帰る
うちへ帰ります。 "( I ) will return home"

うちへ帰って来ます。 "( I ) will go home and come (back)"

TE form verb + verb == do X and Y

Subject assumed to be speaker
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In this context, 帰る can mean either "to come home" or "to go home".
Essentially, it means "to return home", which can imply either direction
(coming or going). So, we use the ～てくる construction (movement toward the
speaker) to make it clear that the person is _coming_ home.

We can also use the ～ていく construction (movement away from the speaker), but I
think it's far less common with 帰る.

Basically:

> （Xは）うちへ帰ってきます。  
>  = X will come home.

> （Xは）うちへ帰っていきます。  
>  = X will go home.

> （Xは）うちへ帰ります。  
>  = X will return home.

* * *

So, if you were out and about, you could say something like,

> ６時に（うちへ）帰ります。  
>  = I'll go home at 6.

Or, someone might say to you,

> ６時に（うちへ）帰っていきますか。  
>  = Are you going home at 6?

But, if you were already at home,

> ６時に（うちへ）帰ってきました。  
>  = I came home at 6.
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I tried to explain this as best as I could, and how I generally think of this
construction.

行く is used when you say someone is 'going somewhere' and 来る is used when you
say someone is 'coming'. The verb you use is dependent on YOUR POSITION.

If I was in America right now and I wanted to say "my friend is going to go to
Japan", I would translate it as 友達は日本に行きます。This is because she is "going away"
relative to my position.

On the other hand, if I were in Japan and my friend, who lives in America, was
coming to Japan, I would translate it as 友達は日本に来ます。He is "coming to me".

You can think of 〜ていく and 〜てくる in the same way.

* * *

Let's assume A-さん is the subject of your sentence.

A-さんはうちへ帰ります。 A-san will return home. (Awkward translation but necessary to
highlight the difference)

A-さんはうちへ帰ってきます。 A-san is going to **come** home.

Using the logic explained with 行く and 来る, you are already at the destination
(that is, A-san's home) and A-san is returning home, which is also towards
you.

Using 〜ていく with this sentence, 「A-さんはうちへ帰っていきます」, you are assuming the
position of someone not at A-san's destination, so when A-san is 'returning
home', he is not 'coming to you'. He is 'going away from you' and so the
sentence would be interpreted as "A-san is going to **go** home".
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