A county board of supervisors may do business with the brother of a board member when they have common ownership of real property but do not have any common debt. Under these particular facts, the joint ownership alone will not give the supervisor a prohibited interest in any contract the brother may have with the county and will not violate Section 109, Miss. Const. of 1890, or Section 25-4-105(2), Miss. Code of 1972. Yet the supervisor must fully recuse from any board action which results in a monetary benefit to the brother, in compliance with Section 25-4-105(1).