My mother-in-law is ill and needs an operation. In order to take care of her, she asked for leave from the company, but the leader refused to approve. Should I go back?

You can take advantage of annual leave and usual vacation to go home, which should be about a week. However, if the leader does not approve the long vacation, the family members can take turns to take time off and go home to take care of it, which makes rational use of the time. As for the sister-in-law, there should be a bride's family, and the child can be left with her for a few days. Your father-in-law can also ask for a week's salary increase, which adds up to almost a month. I think your mother-in-law can probably leave the hospital, too.