lol...dude move the fuck out of the house. Okay to be fair, I've got close friends in India who I know live with their families their entire lives as part of their culture/religion...and this is actually something they like to do as well (As an American, this is very hard for most of us to understand, as growing up and becoming adult and moving out of the house is all kids want as they grow up..that's what we look forward to) and maybe this is the case with your friend? If so, if he chooses to live with them as an adult because of cultural reasons..than I would say be honest. I'd also say sorry but I'm a damn adult, I can bet if I want to.
Sounds like he's got enough money to leave the house now if he wants.
Unfortunately I don't think he is a child anymore, more precisely he is the age of 20-23 has entered the teenage category, and of course if a child is that age, he can work and support himself, so you can let go of his culture and he has Enough courage and money to leave home, based on the amount of money he got and the age that has entered teenagers.
First of all, what he did was wrong because he didn't follow the order of his parent's but now that he already committed the mistake, I think it will now be easy for him to commit another mistake which is to lie, just in case his parents find out about the money. Im sure there must be other profitable activity that is allowed in his country like investing or trading. He can just say that he got the money from those sources. There might still be people who can feel guilty right after making one mistake and they will confess it right away. They think this will lessen the punishment that they will be getting.
Sure it was a mistake but everything had happened and he had brought the money. But if he's not telling the truth, he's already lying but maybe he can use the money to set up a new business. He can also say that his business started small and is trying to grow his business. He can also say that he borrowed some amount to trade or invest and made a big profit. Again, everything had happened and it was up to him what he wanted to tell his parents. Let's just hope his parents take it and remind him that this is for the last time.
I was quite doubtful he was building a business with the money he got, but indeed nothing is impossible if he really can succeed in building a business with money, but usually people who have gotten easy money will be difficult to get out of the gambling ease zone.