(1) lawyer. A lawyer refers to a practitioner who has obtained a lawyer's practice certificate according to law and provides legal services to the society. Although he has obtained the qualification of lawyer, but has not obtained the practice certificate and has not been registered, he shall not act as a lawyer as a defender. (3) Guardians, relatives and friends of criminal suspects and defendants. The guardians of minors are their parents. If parents die or have no guardianship, grandparents, brothers and sisters or other close relatives and friends may act as guardians according to law. For mental patients, their spouses, parents, adult children, other close relatives or close relatives and friends may act as guardians. As for relatives and friends, they refer to relatives of criminal suspects and defendants and friends who are closely related to them. According to the law, as long as you are a lawyer, you can be entrusted as a defender. As for the identity relationship between you and the criminal suspect, it is not a problem, because everything that is not prohibited by law is allowed.