or ... your wife was pregnant and gave birth to a magical child while you were out running around and you missed the whole pregnancy - birth thing. The wizard 'felt' the child being born and came to take it - your wife died protecting it. <img src="/ubbthreads/images/graemlins/disagree.gif" alt="" />
or ... a stranger came by (running from the Wizard with their child) thought it would be a safe place to leave their child - Wizard found out and the rest would be the same?
Just some ideas! <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />