Even he is ill,

She should not give the money, she should reimburse the money... in a reasonable base.

Think about that: They have "house" and "car", that worth a lot. They should be able to pay off the medical bill. There is no reason to leave that to the "step mother", and the no-blood brother.

Until he is pennyless, She should not send any penney to her father, who betray the family.

And remeber, the money she will give to her parents is to make them either "happy" or "above poverty line". Currently his father has no base ask for a "happy" life, because he put her mother into the dugeon forever. So, as a kid, being "xiao shun", she can provide him a "above poverty line" life as a need base. I believe there is some Chinese government has these data available.

And if he is ill, the better way is to sell the house, the car, to pay the medical bill, instead of leave them as the tuition fee for the "step" son.