It is known to all gamblers that once you become addicted to gambling it is impossible to quit. I have been gambling on gambling sites since many years ago and at first i was lost lot of money but later won lot of money. Personally i can say that when i deposit money in a gambling site and play the aim is to double the money so i don't worry if all the money is gone suddenly. On the other hand no one introduced me to gambling sites and i took the idea on my own research. I made myself a gambler through some articles and videos.
It's true what you say , is difficult for a gambling addict to change, but if you definitely intend to reduce gambling, you can do it , especially if you already have a family, you have to reduce your gambling.
to double the money doesn't have to be actually with gambling
Logically right, to have extra money you need to look for other options, doubling your money into gambling that's something that really hard to achieved, sometimes you may win and most of the time you are at risk, what's important is you have that will to move forward, when you lose you need to assess yourself and see if you are still capable of controlling yourself, losing that control will always be the risk behind this activity.
Always have that discipline to make sure not to fall into any potential risk with your financial and mental aspects.