On a constituent record, if you type a name in the Maiden name field, it automatically populates as an Alias. Brilliant! But it doesn't work for any other relationship, which is disappointing.
I would like to suggest that the maiden name alias auto-populate on any record - relationship or constituent - when information is entered in that field.
I believe that you can do this in your configuration options.
That is set already, and only works for the constituent / spouse record. I just did a test, and it does not work when you add relationships. That's where I'd like it to be.