Madouc and Gastel Etzwane (whose mother dies early on) only discover their fathers very late in their respective novels.

I think that the Rhune Efraim was fatherless (Jochaim having died in battle), and had only a step-mother (his biological mother having died in a boating (!) accident). And wasn't Jubal Droad an orphan, raised by his uncle Vaidro?