I think acceptance of the situation and adaptation to it are the most important things you can do right now. But I did like the part of his letter which said that you would need to find a job eventually, but that he is still willing to support the family. This is an opportunity for you to say you want to get the certification to get a better-paying job. Have you talked to him about going back to college to get the degree you need? I know he pointed out that you chose not to go to college years ago. But as you said, that was before you were a single mom needing to support a family. Circumstances change, and the solutions to problems change too.