[Urianger remains quiet as Ithaqua begins his story, listening attentively. He did indeed notice the physical differences between Ithaqua and his mother, but it's a scenario he's familiar with. It's quite an interesting coincidence that the two of them would have experience with being abandoned and adopted into another family. But...the circumstances are not at all the same, as Ithaqua goes on to describe.

He pales as he takes in the scene that Ithaqua weaves with his words, gripping at his robes. He almost finds himself reaching for his lover's hand, but can't be sure if Ithaqua would appreciate an act of sympathy in the moment.]

But thou yet lived. [...] Wherefore would they choose to dispose of thee so? Had they truly thought thee to be dead, why not give thee proper rites? Thou wert but an infant...

[It's deplorable.]