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Economics is a common option. I know couple of people who did that and settled abroad.
it would be of great help if you could also mention the grad schools they went to
Sociology, history, political science - maybe he can teach these in a law school
MA followed by MPhil/PhD in any of the above disciplines would work. There are several law grads like Anuj Bhuwania, Atreyee Majumdar, Kalyani Ramnath who have moved into sociology, anthropology, history etc.
Is your son in a law school? You really cannot be doing all this work for him. If we wants to enter these competitive spaces and be in academia- he should really figure some of this stuff out instead of you steering his career for him.