Is "Whose boy is this?" correct. If not, how would you say that?

Is "Who is this boy?", "?מי הילד הזה"?

As a question in English should be "whose boy is this?"

Why the "של" on the phrase?

Couldn't this also be translated as "Whose son is this?"

He is your servant David, the son of Jesse

If ?של מי הילד הזה translates to "Whose is this boy?", how would one say "Whose boy is this?" in Hebrew? Would it be:

I ?הילד של מי זה?

Well, בֶּן־מִי אַתָּה הַנַּ֫עַר ISam 17:58 Whose son are you, young man?

I misspelled whose, I should still get it right.

Why is to whom does this belong wrong?

we're talking about him like an object.

I always use "who's", I never learned "whose" somehow.