Though I don't completely understand perfectly what you meant, but let me say that, as a gambler, your family finding out you are a gambler or not solely depends on you and your attitude towards them, using myself as an example, I've been gambling way before I got married, though it's not been regular, I became more of a regular gambler since the begining of 2022, but then, in all of this year's, my wife and kids have never for once suspected me to be a gambler, and that is because I never gave them a reason to ever suspect me, so my gambling life have been really peaceful.
As a man, there are some thing you don't let your family know about, cus they know, you will either have to stop doing it, or be ready for fights every day, most especially, when the woman ask for anything and you refuse to give to her.
So the bottom line is that, being able to meet your family's needs is the primary foundation that guarantees a peaceful and interfered life, You are no far from the truth because the only way your gambling life could become a problem is when you are using the money that is meant to run your family to gamble away, this will result into a grave problem in the family, but as long as you do everything under moderation and never get caught up in the cycle of those who can't control their gambling life you won't have any issue.
But on a general note, I think it is too much risk to take by choosing gambling as a means of earning income because gambling should only be meant for fun and nothing more than that.