No, I mean why didn't the family prevent it before everything happened. Before that event happened I thought some strange behavior would be shown. Gambling addiction is also something that the family should remind and continue to advise. And when something like this happens, who is to blame? old man turned into a monster by his addiction? I don't think so, because he clearly can't control himself anymore, and it is the duty of those closest to him to be able to pay attention to his behavior.
It's because the family doesn't know if their son is a gambler, how they can stop the gambling addiction when they don't know if their son is a gambler in the first place. However I've know some family have stop their son to stop gamble, but it's not worked because the addiction is really control his mind. When it's happen, it's better for a professional to take care about it.