Hi -
Are you sure the error you get when you run the report is actually resulting from the query? Do you have that field - ta_people.DOB - on the report? If so, maybe the error is there - Access cannot determine which ta_people.DOB you are referring to.
One other thing I notice - looking at the queries, I do not see anything that ensures the the two ta_people.DOB values will be the same - are they supposed to be for the same person? What you might want to do is remove any fields from qu_IssueInfo that you do not need (or use another query), to avoid the duplication of fields issue.
John