How is the India/China border dispute realated to Hans Island?
The only real relationship between these two is that they are both border disputes. In addition, they are both in rather remote areas where people do not live. Outside of that, they have little in common.
The Hans Island dispute is between two countries (Denmark and Canada) that are not in any way enemies now and have not been in the past. By contrast, China and India have been enemies in the past and are certainly rivals today. The Hans Island dispute is centered around resources, the dispute between India and China is not.
Therefore, the only real thing that the two have in common is that they are both border disputes centered around remote areas.