Full Idea
If there is nothing in the nature of Socrates which demands that he exists, then presumably there is nothing in the nature of Socrates which demands that his parents exist.
Gist of Idea
If Socrates lacks necessary existence, then his nature cannot require his parents' existence
Source
Kit Fine (Essence and Modality [1994], p. 6)
Book Reference
-: 'Philosophical Perspectives' [-], p.6
A Reaction
This sounds conclusive to me, against any claim that Socrates necessarily had those parents, if the claim is based on the identity or esssence of Socrates.