When Tom first approaches his pa, his father at first does not recognize him, and then asks him if he has broken out of prison. Tom experiences the same question when he goes in to greet his ma.
Ma's second question is if being in prison has caused Tom to go "mad". She is concerned because she knew Pretty Boy Floyd, and says that after he went to prison he became "mean mad". Ma worries about the effect prison has had on her son, and while not asking any more questions of him, she wants to know if he is still the same son she had before he went to prison.