You don’t need to tell your relatives. You can, however, share it with your parents, if you want. I wouldn’t recommend though. It’s unnecessary burden to your parents, unless your parents are dependent upon you for daily survival.
That being said, I did tell to my parents, as I was paying their monthly bills. So that they are prepared. My parents aren’t dependent on me, but I made it a point to pay my parents recurring bills every month ever since I started working.
One more thing, which you should definitely do is to get health insurance as well as top up(should be at least 50 lakhs).
Apart from my mom and dad, no one knows, not even my sister and in-laws. It’s not required to tell everyone.