He is considered the ancestor of the Prys or Price of Esgairweddan family, who bore the royal arms of Gwynedd as their own.
It is generally considered that this family, in the direct male line descent, died out on the death of Robert Price of Esgairweddan in 1702.
Even if he had reached his majority by the time of his father's death his path to the throne would have been contested.
Owain and Llywelyn were themselves the sons of a bastard and also barred from the throne which suggests they were adults and in a position to press their claim while he was not.
According to Old & Extinct Families of Meirionyddshire the last known heir male of Dafydd, Robert Price, died in 1702.