How to add another petitioner in writ petition of supreme court

hi i am writing a writ petition as part in person in supreme court and i want to add my brother as second petitioner he has written his second petition on the same issue with few extra facts pertaining to him i don't know how to add second petitioner can some one tell me how to add second petitioner is it in the same petition should we club both petitions like petition of 1st petitioner followed by affidavit of 1st petitioner few extra points from second petitioner followed by affidavit of second petitioner or club all points in one petition followed by affidavit of first petitioner and affidavit of second petitioner and we want to file single petition not 2 separate petitions.