Parents who gamble

Those of you who had parents that gamble excessively did you try to help or you stood back.
For context my parents are at the pub almost 7 days a week, borrowing money and most likely in debt, deny there is a problem at all and then argue with each other when they don’t get a win. And then back again the next day. To be fair I can never say I have gone without anything as a child but it seems to have gotten this bad as me and my siblings have moved out except for one who has just turned 18 and they think it’s great he goes to the pub with them. I tell him all the time not to as he will end up just like them and that it’s an utter disgrace they sit there with him playing knowing that gambling isn’t good for anyone. Im not a very empathetic person and I snap pretty easily if they deny it to my face which just pisses me off so I’d rather avoid the conflict but it’s getting to the point that even their appearance is taking a toll like cannot even pay to see a dentist because they would rather go to the pub. I’m not sure if it comes down to depression or something more