For one thing, we have no idea what kind of childhood Suder had.
Second, of all the characters, why pick Spock's childhood as a basis for him? Suder was not half Betazoid, he was full. And Vulcan and Betazoid societies are quite different. (Betazoids are open and much more free about expressing themselves and emotions... they have weddings naked. Vulcans: few races are as private, emotionally controlled, and reserved as they are. Except for a preference for peace and telepathic abilities, they really don't have a lot in common.)