I'm sorry, I oversaw that query.. Here is the one that should work...
...
WHERE (((PERSON.Dob) In (SELECT [Dob] FROM [PERSON] As Tmp GROUP BY [Dob] HAVING Count(*)>1 )))
AND ((mid(PERSON_NAME.Lastname_name_local1,1,3) In (SELECT mid([Lastname_name_local1],1,3) FROM [PERSON_NAME] As TMP1 GROUP...