The brother obviously needs to determine what is best for him in a spiritual way. Consider another possible situation.
دُونَ شَكٍّ ،‏ يَجِبُ عَلَى ٱلْأَخِ أَنْ يُحَدِّدَ مَا هُوَ ٱلْأَفْضَلُ لِخَيْرِهِ ٱلرُّوحِيِّ .‏