Your partners either a) know what they are asking you to do is unfair and are asking you anyway, in which case they are assholes, or b) don't know what they are

Your partners either a) know what they are asking you to do is unfair and are asking you anyway, in which case they are assholes, or b) don't know what they are asking you to do is unfair, in which case they are idiots. This is a no-win situation, time to cut your losses and move on as quickly as possible.