Gambling Addiction & Recovery Support Group
Compulsive gambling is an urge or addiction to gamble despite harmful negative consequences or a desire to stop. A preferred term among many professionals is problem gambling, as few people described by the term experience true compulsions in the clinical sense of the word. Problem gambling often is defined by whether harm is experienced by the gambler or others rather...

Lots of factors etc.
Since you and your brother both share this trait it might be worth looking into, since now, quitting gambling you may find that you have more.
Look at people who win lotteries and then end up right back where they were because they weren't "used" to it.
One of the gambling addiction recovery suggestions is to prepare for financial stability; something we aren't used to.
Great looking at it now and getting ready for the "windfall" without addiction.