call them after their own fathers that is closer to justice in the sight of god. if you do not know their fathers regard them as your brothers in faith and your proteges. you will not be blamed if you make a mistake you will be held accountable only for what in your hearts you have done intentionally. god is forgiving and merciful.
ادعوهم لآبائهم هو أقسط عند الله فإن لم تعلموا آباءهم فإخوانكم في الدين ومواليكم وليس عليكم جناح فيما أخطأتم به ولكن ما تعمدت قلوبكم وكان الله غفورا رحيما