I couldn't really understand your post, some words seemed to have dropped out. Are you saying you, your cousin, your grandma, your child AND your husband are living there? The husband is not mentioned when you talk about the bedrooms.
If you are all there, is there a problem with working or not working? Because your uncle will probably take the news of another child better if you can also tell him about what work your husband is doing, or the jobs he is looking for.
If you are all four in a 2-bedroom house and barely getting by, I am not sure what you can say to your uncle to make it all be all right.