Is zakat obligatory on sheep raised for fattening, and what is its amount? Is zakat obligatory on grazing sheep? Is zakat obligatory on the fruits of trees that are five years old? And what is the legitimate way to divide the proceeds among partners in a project?

Zakat is not obligatory on sheep fattened for sale, because they are trade goods. Zakat is obligatory on their market value at the end of the year (hawl), by combining it with other wealth and paying zakat on the total if it reaches the nisab. As for grazing sheep in permissible pastures, their zakat is obligatory. Regarding the farm, zakat is not obligatory on its produce unless it is dates or raisins and reaches the nisab. For anything else, zakat is due on the money generated from its sale if it reaches the nisab and a year has passed over it. The ownership of the farm's produce and the sheep belongs to your father, and your brothers are entitled to a share by agreement with him. As for you, you are not entitled to anything unless you are a contributor to the project.