Mail selecting wrong Address Book entry

[AlanWilson]

I have two entries in Address Book:
same surname, home email address, home address & phone
different first names (Jeff and Jackie), work email addresses.
When I type Jeff into the To field in a Mail new message, it shows Jackie and the choice of her home & work email addresses: I can't get Mail to accept Jeff.
Presumably this is because they have the same home email address and Jackie comes before Jeff alphabetically.
But there must be a way of showing Jeff instead of it being changed to Jackie in the To field!
What am I missing?
I have removed previous recipients in Mail (Windows, Previous Recipients).

 

[Satcomer]

Well in your Address Book are both people on the same Address CarD (Husband & wife)? Plus mail will take the first address listed in the Address Card for that person. So if the work email address is first hence that work address will come up.