Answer:
<u>The family lives in a big city in a flat in Wales. <<< Answer</u>
<em>Tell me, what makes the most sense to you?</em>
<u>If you were to say...</u>
The family lives in a flat in a big city in Wales.
<u>If you were to say...</u>
In Wales the family lives in a big city in a flat, it doesn't connect properly.
<em>Which one sounds proper to you?</em> :)
We turned the sentence into an <u>Independent Clause</u> by adding the following so that it can stand alone as a sentence.
<em>The family</em> is a <u>subject</u> that has a <u>verb</u> getting attached to it which in our instance is "live".
<em>In wales</em> is one of two <u>prepositional phrases</u> as it answers the wherein our grammar structure. EG: <em>In a flat</em> is the other <u>prep phrase</u>.