If a United States citizen outside of the United States who has never lived in the United States has a parent who is a qualified elector of the State, then that person is eligible to register and vote where that citizen's parent is a qualified elector.
Structure Delaware Code
Chapter 20. REGISTRATION OFFICERS AND MOBILE REGISTRATION; REGISTRATION BY MAIL
Subchapter II. Procedure at Registration Place
§ 2011. Entries by registration officers.
§ 2012. Challenge for bribery; oath; effect of oath; refusal to take oath.
§ 2013. Duties of Department following registration.
§ 2015. Late registration procedures for military and overseas citizens.
§ 2016. Enfranchisement of citizens who have never resided in the United States.