What is the ruling on taking money from a brother in exchange for a partnership in his institution, without work or effort?

What your brother wants from your employment without actual work is a circumvention of the law, which mandates the employment of a certain percentage of citizens to benefit from specific advantages, and this is forbidden (haram). Some companies resort to employing individuals who do not wish to work for low salaries, which harms the public interest and does not achieve the law's objectives in reducing unemployment. It is advisable to consult scholars of knowledge (ahl al-ilm) in your country to ascertain the details of the law.