How do I say "Who is the tallest in your family?"


Is this correct? 家族に中で背が高い誰ですか。




You would use の instead of に here (linking two nouns), so 家族の中.

You also want to insert a superlative (phrase that means "most"/"best"/#1).
One example is 一番（目）. There are many others, like もっとも, だれより（も） (less common),
etc.

So something like:

> 家族の中で一番背が高い人は誰ですか。

For some basic examples of superlatives, see [this
page](https://en.wikibooks.org/wiki/Japanese/Grammar/Comparisons#Superlative).

