This is why as a responsible gambler, parent, and husband/wife, you should really take time to make your accounts secure to avoid things like these that can be prevented by taking precautions. Disciplining your kids and letting your kids and wife/husband know that it isn't right to touch someone else's property unless you permit them to do so, will have a very big impact despite how simple that act is. Putting security passcode to your mobile device and user account in your desktop could be of great help as well so they won't be able to access what isn't allowed.
With our technology nowadays, you can set up a dual space in your mobile device wherein you could switch from time to time depending on who will be using. You could also install or activate the work profile mode in order for you to do your business there and your kids will still be able to play with your phone. App lock can be useful too the same way with making another user to log in in desktop.