➊ The punishment for a criminal act cannot be given to his father, son, brother, friend, or others.
➋ It is religiously prohibited to put pressure on the relatives of a fugitive criminal in order to apprehend him.
➌ It is permissible to apply reasonable pressure to a suspect in order to obtain a confession.
➍ It is permissible to apply reasonable pressure to a suspect or criminal in order to obtain information about his accomplices, provided that there are such indications which demonstrate his being a suspect or criminal. And Allah knows best.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 2672