call them sons of their own fathers. it is more just in the eyes of god. if you do not know their fathers they are your brothers and friends in religion. you will not be responsible for your mistakes but you will be responsible for what you do intentionally. god is allforgiving and allmerciful.
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