Read Surah Al-Ahzaab 33:55: "[However,] it is no sin for them [to appear freely] before their fathers, or their sons, or their brothers, or their bro..." Full Arabic text, English translation, and image generator.
لَا جُنَاحَ عَلَيْهِنَّ فِي آبَائِهِنَّ وَلَا أَبْنَائِهِنَّ وَلَا إِخْوَانِهِنَّ وَلَا أَبْنَاءِ إِخْوَانِهِنَّ وَلَا أَبْنَاءِ أَخَوَاتِهِنَّ وَلَا نِسَائِهِنَّ وَلَا مَا مَلَكَتْ أَيْمَانُهُنَّ ۗ وَاتَّقِينَ اللَّهَ ۚ إِنَّ اللَّهَ كَانَ عَلَىٰ كُلِّ شَيْءٍ شَهِيدًا
[However,] it is no sin for them [to appear freely] before their fathers, or their sons, or their brothers, or their brothers’ sons, or their sisters’ sons, or their womenfolk, or such [male slaves] as their right hands may possess. But [always, O wives of the Prophet,] remain conscious of God - for, behold, God is witness unto everything.