Perhaps you could lay down a few scenarios for your dad to think about, given the fact that your family's financial situation isnt well
One example i can think of is where one of your family members fell ill and is in need of a large sum of money for treatment. Let your father know that if he squanders the family reserves away via gambling, there will be no money for whoever that is in urgent need of treatment. What happens next? Your family have to sell house, borrow money, homeless, basically in a situation that im sure your father do not want to be in. If he truly still cares for the family, im sure this little situation will give him some food for thought, or at least he would gamble with more awareness and limits himself such that he does not deplete the family reserves.
Another example could be your future, explain to him how important college is to you, and sustaining school fees is no joke. If your family cant support you for your education, its basically an even tougher life ahead for you and your family.
I feel the key is to let your father be aware of the consequences of the worst case scenarios, and if this do not work, then you just have to battle it out with him man to man, as im pretty sure you do not want to be in the "worst case scenario" situation, hence you have to step up
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