Have only remark by dad that he thought he hade a son. Dad was resident etc. at duke hospital where he possibly had girlfriend that may have gotten pregnant and had a child. May have lived in salsbury area... not sure of this.

Not enough information to even start looking,
1. don't even know if there is a child
2. don't have name of girlfriend
3. don't have even a close date of birth

So really just see if anyone of family knows more.