Thanks for putting this into the mix, Lars, there is confusion amongst all historians, I think, about which of Henry I's Illgt. children were borne by whom. You'll find Sibylla de Corbet is not recorded in this tree as the mother of Elizabeth Joan/Emma although this is a possibility. Geni as yet does not have the ability to show 'possible' connections so we have to be satisfied with mentioning such possibilities in the 'about me' section.
I hope this satisfies you.