I am sending a resource to two group leaders who have the option of sharing it. Which, if either, of the below are correct:
They can put it on their respective groups' websites.
They can put it on their respective group's websites.
Since each website only belongs to one group, I would think the second is correct. However, "websites" here is a collection of two things, so the first might also be right.
Please include an explanation with your answer.