I am currently learning ~たことにする but I am not so sure how to translate it.

The example sentence is:

> 私が日本にいる間に、家族がドイツへ旅行に行ったなんて、きかなかっ **たことにし** たいなあ。
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grammar translation meaning
The meaning of ~たことにする
According to [jisho.org](https://jisho.org/word/%E3%81%AB%E3%81%99%E3%82%8B),
the meanings of にする include:

>   1. to decide (on something)​
>   2. to place, or raise, person A to a post or status B
>   3. to transform A to B; to make A into B; to exchange A for B​
>   4. to make use of A for B; to view A as B; to handle A as if it were B
>   5. to feel A about B
>

>
> where definitions 2-5 have the form "AをBにする"

We can apply these definitions by splitting your sentence into an "A" and a
"B", then thinking about which of the 5 definitions seems the most plausible.
You can split the sentence into an "A" and "B" as follows:

> A：私が日本にいる間に、家族がドイツへ旅行に行ったなんて、
>
> B：きかなかったこと
>
> にしたい

Thus, interpreting the sentence literally, the speaker is saying that they
want to "transform/make/view/handle" the fact that their family went to
Germany while they were in Japan _into_ something that they didn't hear.

My interpretation is that the speaker wants to go to Germany too, so hearing
that their family went without them was painful, and therefore the speaker
wishes that they had never heard about it.
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answer