My husband wants his brother to do business with me, and I am reluctant. What should I tell him?

Since it's your husband, tell him frankly what you think and let your husband weigh it for himself. You can try to give some other suggestions. If he doesn't have a skill, why don't you sign him up for a training class or something? If he still insists, negotiate, let his brother try with you and write the rules clearly. If his brother can't keep it, forget it. Maybe your husband has his difficulties, too