Yeah, that's grief for you, changes your world, your feelings, what was previously normal vs. what is now the new normal. Just go with your feelings, they will guide you; I'm sure your T will be able to help you process them. As for transference, yeah your feelings about that might change for awhile as your body and mind process the passing of your dad and your client. Sometimes I think our systems can only take so much and parts of them shut down. Just let yourself go with how you're feeling at the moment, grief is not something we get over, it's something we get through each in our own way.