Varien married another woman who already has a child of her own blood to distract himself from having romantic and sexual fantasy about you, because you're his step-child and he knew the reason why he loves you in that way is because you have the spitting image of your previous mother who is blood related to you.

"Hello, my lovely darling! This is my new wife that I have been talking about to you and these are her biological children, so please be nice and kind to them."