One of the possibilities initially floated, and please correct me if this is not one potentially in play here, was that House Dorcha was part of, or had broken away from, a House that had fallen into disgrace and been attaindered some time ago. This is the part of the family that has regained some status and is intent on demonstrating that living well is a sufficient revenge.<br/><br/>It is possible that Eliza is a natural child resulting from a youthful indiscretion predating her sire's marriage, yes.  :D