If your family's conditions are not good and your brother-in-law takes you out to work, how can you tell your brother-in-law that you don't want to work anymore?

Why don’t you want to do it? Is it because the job is not suitable, the salary is low, or you just can’t bear the hardship? There are both objective and subjective reasons. If the job is really not suitable for you and you have expertise but cannot put it to use, just say so and find a job that suits you and promotes your technical growth. I think your brother-in-law must be happy that you have pursuits and ideas. If the salary is too low, then you have to see whether it will increase in the future and make a decision after understanding it clearly. If it's just because you can't stand the hardship and you feel tired or dirty at work, you should reflect on it. There are no easy jobs these days. Even technical and management work is laborious and not as easy as you think. As the saying goes, God rewards those who work hard, and there is no free lunch in the world. Happiness depends on your own hands and labor.