Private User the profile of Harald, King of Limerick currently displays as a son of Sitric "Cáech" ua Ímair, King of Dublin & York
This is matched by Curator notes and descriptions in the About sections of both profiles with links to various websites, including Medlands.
However, Medlands no longer supports this relationship.
Here are the two entries for Sitric Caech http://fmg.ac/Projects/MedLands/IRELAND.htm#SihtricYorkdied927 http://fmg.ac/Projects/MedLands/ENGLAND,%20AngloSaxon%20&%20Dan...
Here is Harald http://fmg.ac/Projects/MedLands/IRELAND.htm#_Toc389126207
It looks to me that Cawley has for 3 refernces to Harald's parentage, 2 of them indicate Sitric Caech but the 3rd a different Sitric, Cawley seems to have decided that a 2 out of 3 is not strong evidence and so has disconnected Harald and left him free to float.