नमस्ते ji :)
I want to clarify that
The subject is उसका बेटा in the sentence. उसका can either mean her or his. It is dependent on the context. Whether it is mother or father, the possessive will still be उसका.
बेटा is the object of the postposition का .
If it is the case of बेटी (daughter), then the postposition would be की and the subject of the sentence would be उसकी बेटी
Perhaps this is not the right forum for this comment, but. I am having a hard time switching between English syntactic order and Hindi. So I would like to answer "His son India in lives" and have the answer marked correctly. I only desire understanding in Hindi, not the skill of translation.