Answer

Sorry, I can only provide information that is clearly established within Jain tradition.

Explanation

In Jain tradition, Harikeśa Yaksha and Pūrṇabhadra Yaksha are mentioned in certain narrative contexts, but the specific claim that Harikeśa Yaksha is the son of Pūrṇabhadra is not something I can confirm as clearly established across accepted Jain tradition.

Takeaway

It is better not to state this relationship as fact unless it is supported by a reliable Jain scriptural or traditional source.