Never even thought about keeping it a secret from my family. If you are responsible for your own budget and are responsible for what you do yourself, then why should there be any secrets? If there is an understanding of risks and competent budget management, then you will simply see what can bring you money, and where losses occur.
Your family must be really cool and understanding. Coming from a home that is religious doctrine would never understand a bit, society has set a standard for gamblers as irresponsible people that's why they don't show people that they gamble.
I don't know how things are in your country, but in our country many students combine studies with work to become independent of their parents.
In my place, you hardly see varsity students who don't use a sportsbook, they gamble to survive and gamble for fun combine even as they do their outside work to support their academics, sometimes I do feel it is too many Ads of bets they see that do contribute to this behaviour.
If I found out that my child is gambling with the money I send him to live, I would be very upset. I believe that if a person decides to gamble, he should spend the money he has personally earned, not the money his parents give him. Think about it.
My country's minimum age to start gambling is 18, that's an adult. It is up to him to use it wisely as long he doesn't ask you for another upkeep.