Of course it happens that way. I know of cases where people with very severe alcoholism and drug addiction have returned to a normal life only thanks to their family. That is why we should not underestimate the role of family in the fight against gambling addiction. Also gaming addiction is much easier to treat than alcohol or drug addiction.
What I noticed is that someone can be very addicted without his family knowing he is addicted to gambling, that is where the problem is, but this can easily be known for someone that knows his husband or children very well, the most common sign is when the husband or child will look at his phone or laptop and get moody from happy moment, if this occur frequently, it should have been known that online gambling is what that is affect the person. What the family can do is to be supportive, have believe in the person and they should let theperson know that, monitor the person and even very good to seek for medical intervention which is very effective.