Andy, Bob, Christine, his girlfriend, Debby and I are going for dinner tomorrow.
Christine is Bob's girlfriend. There are no other relations. There are five people altogether. Is the quoted sentence correctly punctuated?
It would be even more confusing if the adjacent name and explanation had the same gender:
Andy, Bob, Chris, his brother, Debby and I are going for dinner tomorrow.
Is Chris Bob's brother or is the unnamed brother of Chris joining dinner? How to avoid the ambiguity here?
(I am aware of a related question but semicolons seem to be overkill here.)