If he gets fired, you and the girls will survive. It might not be easy, but there are services available that can help you. I don't remember if you work or are able to work, but that could be an option. There is always a way. Many, many people manage it every day and you can, too. He could get fired for reasons other than sleeping at work and you would be in the same position. It's not worth it to make bad decisions now for fear of something that may not even happen.