そのお菓子を息子にくれますか？

そのお菓子を息子にもらえますか?

Apparently these sentences are equivalent, but as far as I know に marks the
subject who gives the object, I don't understand how do they have the same
meaning

Is there anything am I missing?
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question
word-choice giving-and-receiving
equivalence between くれる and もらう
This くれる means "someone give something to someone", so the action is the other
side. そのお菓子を息子にくれますか? is translated as "Can you give the snack to my son?"

This もらう means "someone receive something from someone", so the action is
speakers' side. そのお菓子を息子にもらえますか? is translated as "Can I receive the snack
from my son?" but it is unnatural to say that to someone.

I think "そのお菓子を息子にくれませんか?", "そのお菓子を息子にください" are more common than
"そのお菓子を息子にくれますか？".
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answer
> If you use「もらう」the subject is **you** or **_someone in your in-group_**
>
> If you use「くれる」the subject is **someone else**

In **_both cases_** the _beneficiary_ is you or someone in your in-group.

  
In example:

>   * 息子に渡{わた}して **くれた**
>

>
> (They) handed (my) son (some sweets) **for (me)**
```

    Someone handed something to your son for you
    
```

  

>   * 息子に渡して **もらった**
>

>
> **_(I) had_** (our) son hand (them) (some sweets) **for (us)**
```

    You had your son hand something to someone for you and your wife  
    
```

  

>   * 息子に渡して **くれませんか？**
>

>
> **Would (you)** hand (my) son (some sweets) **for (me)?**
```

    You are asking someone to hand something to your son  
    
```

  

>   * 息子に渡して **もらえませんか？**
>

>
> **_Can (you)_** hand (some sweets) to (my) son **for (me)**?
```

    You are asking someone if they will hand something to your son for you  
    
```

  

>   * 息子に **もらいました**
>

>
> **_(I) got_** (some sweets) from (my) son
```

    You received something from your son  
    
```

  

>   * 息子に渡して **もらいました**
>

>
> **_(I) had_** (him) hand (some sweets) to (my) son
```

    You had your son hand something to someone else for you
    
```
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answer