Should my sister go to school?

It depends on the situation. In our country's law, only parents have the obligation to raise and educate their children, and the mutual help between brothers and sisters belongs to the scope of moral adjustment, so there is no clear legal restriction, so the elder sister has no legal obligation to provide her with the opportunity to go to school. If she is able, she can help her sister. After all, blood is thicker than water, and this is the closest person besides her parents.