Sitric "Cáech" ua Ímair, King of Dublin & York is showing on Geni as Ivarr Gudrodson, king of Dublin's son which means we are missing someone in between.
Cawley shows:
5. SIHTRIC "Caoch" (-[926/27]). The Annals of Ulster record that "Sitriuc grandson of Imar landed with his fleet at Cenn Fuait on the coast of Laigin”
http://fmg.ac/Projects/MedLands/IRELAND.htm#_Toc389126206