I have 3 fields Title, Forename(s) & Surname from which I use an expression to address a letter. It works fine of most instances. I use a function to extract initials from the Forename(s) field.
For example:-
Mr & Mrs John & Jane Smith
turns into
Mr & Mrs J & J Smith
A problem is an unmarried couple. For example: –
Mr & Miss John & Jane Smith & Jones
turns into
Mr & Miss J & J Smith & Jones
which is clunky