The road to art is paved with money and needs a strong economic foundation as the backing. I wonder if your family has it?
2. Professional foundation and artistic atmosphere
I suggest you find an expert in acting to see your brother's qualifications and potential. If you are qualified, give it up. If any of your relatives and friends are engaged in artistic work, you can introduce them and provide more help.
3. Strong personality and healthy body
The road to art is full of thorns, which ordinary people like you and me can't bear. It needs great courage, endurance and indomitable spirit, as well as strong psychological endurance. Filming is very hard, so the importance of good health is self-evident.
I suggest you and your family re-examine your brother. If you find that he has advantages in other industries, let him develop in other fields. Art is not for everyone.
I'm not throwing cold water on you, but I know the hardships and prepare you and your family psychologically. At the same time, I wish your brother can find a suitable job and develop himself well.