Sometimes we expect more out of our computers than what they where designed to run. That's the case here. The game you are trying to play is very CPU & GPU intensive!
Think how a greyhound will run to its death. Computers are no different!
Basically your system does not have the needed cooling capacity to prevent it from overheating which is the root issue here. Its not designed for this type of gaming. Your relative's system is likely a more powerful laptop or desktop system so they haven't encountered the over heating problem you have.
Take the game off and hopefully you didn't damage the system permanently.