Geoffrey of Ragusa was a son of Roger I, Count of Sicily.
[2] In 1091, Geoffrey was granted the County of Ragusa by his father.
[3] Geoffrey married a woman named Rogalia, and had five children with her:[2][3] Different sources[4][5][6] also claim that from “Geoffrey, one of Tancred’s sons” descends the Guarna / Avarna family [it].
These sources also describe said Geoffrey’s sons as Counts of Marsico.
It is thus probable that the sources are mistaken when they talk about a son of Tancred, and that they’re actually referring to this Geoffrey, the Count of Ragusa, as the ancestor of the Avarna family.