The Question and Answer section for A Raisin in the Sun is a great resource to ask questions, find answers, and discuss the novel.
Ruth is pregnant, I am not aware of any other characters with health issues.
This is really asking for your opinion rather than mine. I don't know how far you have read to. For what its worth I liked Mama's stoic and patient attitude, especially to Walter.
Ruth doesn't like rats. Travis has been chasing them in the basement.