Whether the unbelieving mate realizes it or not, he or she is “sanctified ” because of being married to a believer.
وَأَوْلَادُهُمَا ٱلصِّغَارُ يُعْتَبَرُونَ ‹ مُقَدَّسِينَ › ،‏ أَيْ مَقْبُولِينَ فِي نَظَرِ ٱللهِ .‏