Can 'what' be the object of the main clause and the object of a dangling modifier of the subordinate clause at the same time?

Question

Here's such a sentence:

His dad needs to find what magazines he grew up reading.

The 'what' here is the object of the main clause.

His dad need to find what magazines (object).

The subordinate clause here is:

what magazines he grew up reading.

The problem is, 'what' is not directly the object of the subordinate clause, but the object of the dangling modifier of the subordinate clause.

The subordinate clause without dangling modifier:

(what magazines) he grew up.

The dangling modifier:

reading (what) magazines.

So you see, 'what magazines' here is

1. the object of the main clause,
2. the object of a dangling modifier of the subordinate clause.

Is this sentence grammatically wrong? I've never seen sentences like this before. It sounds natural to me, though.

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Notes: I didn't learn grammar in English, so some of the names may be misused.

For those who may ask, this sentence is inspired by a line of a recap. The original sentence is

I think his dad needs more time to know his son, understand his preferences, and maybe find what magazines he grew up reading.

Answer 1

There's no dangling modifier in your sentence.

"His dad needs to find what magazines he grew up reading."

The deep structure of the sentence is something like this:

His dad needs to find [something]. His son grew up reading [some magazines].

First step is to replace "some magazines" with the pronoun "what magazines":

His son grew up reading [what magazines].

Next, front the pronoun:

[what magazines] his son grew up reading __________.

Finally, connect the two clauses together:

His dad needs to find [what magazines] he grew up reading _________.

We don't pronounce the _________ after "reading", but it represents the place the object "what magazines" comes from. "What magazines" is the direct object of "reading", so "reading" isn't dangling.