if you didn't watch after these kids, would they be left alone?? it's not right for your housemates to neglect their kids you may be the most important person in these kids lives right now, so try to make the best of the time you have with them share your concerns with your housemates they need to realize that those kids are only going to be young once, and they will regret missing out on such a valuable time that they can never get back
What is a housemate? Is that another name for husband? If so Thump him upside his head. If he is the bread winner begin to think of ways for you to earn money so that you can feel secure just in case he decides to up and leave.