Perhaps in the eyes of parents, children are all their own after all. If you see that your brother wants to spend money on a car, but the money is not enough, you may ask your brother and sister to help you sponsor it, because in the eyes of parents, brothers and sisters should be a family and brothers must help each other. However, as modern people, we should cultivate a correct view of consumption. Things like buying a car are consumer goods. Not buying a car can be solved by other means of transportation, but buying a car is just convenient. If you show off, you will be ahead of consumption. So in this case, it still depends on my brother's own economic strength. If my brother's usual salary can completely cover the cost of using a car, but he just lacks a little money when buying a car, he may give the money to his brother as a sponsor. However, if my brother's income is not very high and one month's income is not enough to keep a car, then I may discuss with my parents whether it is necessary to buy a car, whether to wait until my brother's income can be improved two years later and cultivate a correct consumption concept.
Therefore, if parents want money to buy a car for their younger brother, I don't think they will agree at first. At least they will find out the whole economic strength of their younger brother, and then they will see if they really need it or say they want to show off. If they want to show off, they may refuse. Then, if my brother buys a car himself, he will really pay some money for the convenience of work or improve his overall work efficiency, and at the same time, he will communicate with his parents and cultivate his correct consumption concept.