It means we'll (all) see each other later. The speaker says this to both of the people whom he/she is wishing. Its like saying goodbye to two of your friends. So you say 'Goodbye X and Y'. The exercise question's wording is a bit twisted.
Just 'See you (both) later' would be fine.
'See you (both) later' would be more natural.
Does this mean, "We will (all) see each other later," or "Make sure you see each other later"?
so I agree that the translation should be revised. :) (or the question; however you see it.)
"We will see each other later, Esther and Rashidi."