What should a person do whose father and brother work in haram commercial insurance, and he is studying with two years left until he graduates?

Your friend must advise his father and brother to abandon unlawful work, with wisdom and good counsel if they are Muslims. If they are disbelievers, he should invite them to Islam and be a good role model for them. As for eating from his father's money, there is no harm in it for him if he cannot find sustenance otherwise, for the Prophet, may Allah's prayers and peace be upon him, ate from the food of the Jews.