What can a husband do when a wife threatens to leave with the child?

The husband can not do anything. They can not do anything he just leave because that means the wife was never there for them our for love just for half the time hard to say but MONEY or whatever she wants she then has the power to get whatever she wants she can get anything

When my mom did that to my dad, he could not do anything. But us kids didnt want to go with our mom because we knew what she was doing. But the husband cant do anything, and if he does go to court about it.