So sorry to hear about your relative.
Megxon is not a standard camera brand. It is apparently made by the same company that makes the Praktika Luxmedia cameras. Take a look at the Praktika Luxmedia camera line
and see if you can find one that is the same as, or substantially similar to, the Megxon camera you have.
Have you tried to see if standard USB camera cables will work on this camera? There are several "standard" USB plugs often used on digital cameras. See this article on USB at Wikipedia
. Take a look at the Micro and Mini plug illustrations and see if you can identify the plug on the camera. If you can identify it as a standard USB plug, then you should be able to purchase a USB cable with the correct end to fit into the camera.