Is there a direct logical conflict between the premise and the hypothesis? Premise: If he were someone who was an assistant, with an ailing mother to support, well, it would be impossible. Hypothesis: It would not be possible if he was an assistant with a sick mom. 
If he were someone who was an assistant, with an ailing mother to support, well, it would be impossible.###It would not be possible if he was an assistant with a sick mom. 