I would probably get rid of the laptop so he can't use it. Your mother will not be sleeping when there is no house if he loses everything. If you father can go a month without gambling, Its seems more of an impulsive behaviour and poor decision making rather than a physical addiction- if he was truley addicted he would be doing it non stop, but he is going a whole month and has a few smaller bets than gets carried away and has a big bet after multiple smaller bets.
If it were my dad and he got louder and verbally abusive, bad luck mate is all i would say to him.
Another option could be although not the best and likely not to work due to his impulsiveness is to give him a "bankroll" and say to manage this by having 100 smaller bets, if you lose it it is NO MORE money for you.
He's not the type to be satisfied by just small bet , he just started small , and whenever he ask us for the internet connection and laptop , he'll always say " Relax , i only bet a two three million rupiah. " , and over time he won't get satisfied by winning with small bet , and eventually he'll bet bigger with 25million rupiah and above , and then eventually he'll lose and be all desperate for a week and so , and after the month and so , he'll re-do it again by saying " Don't worry , this time i only bet a two three million rupiah. "
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