The Prophet ﷺ used not to enter any house in Medina except the house of Um Sulaim besides those of his wives when he was asked why, he said, "I take pity on her as her brother was killed in my company. "

أَنَّ النَّبِيَّ ﷺ لَمْ يَكُنْ يَدْخُلُ بَيْتًا بِالْمَدِينَةِ غَيْرَ بَيْتِ أُمِّ سُلَيْمٍ إِلاَّ عَلَى أَزْوَاجِهِ فَقِيلَ لَهُ فَقَالَ: «إِنِّي أَرْحَمُهَا قُتِلَ أَخُوهَا مَعِي۔»

Messenger of Allah ﷺ said, "Beware of entering upon the ladies." A man from the Ansar said, "Allah's Apostle! What about Al-Hamu the in-laws of the wife (the brothers of her husband or his nephews etc.)?" The Prophet ﷺ replied: The in-laws of the wife are death itself. (Using translation from Bukhārī 5232)

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «إِيَّاكُمْ وَالدُّخُولَ عَلَى النِّسَاءِ» فَقَالَ رَجُلٌ مِنَ الْأَنْصَارِ أَرَأَيْتَ الْحَمْوَ؟ قَالَ «الْحَمْوُ الْمَوْتُ»

Messenger of Allah ﷺ said, "Beware of entering upon the ladies." A man from the Ansar said, "Allah's Apostle! What about Al-Hamu the in-laws of the wife (the brothers of her husband or his nephews etc.)?" The Prophet ﷺ replied: The in-laws of the wife are death itself. (Using translation from Bukhārī 5232)

أَنَّ رَسُولَ اللهِ ﷺ قَالَ إِيَّاكُمْ وَالدُّخُولَ عَلَى النِّسَاءِ فَقَالَ رَجُلٌ مِنَ الْأَنْصَارِ أَرَأَيْتَ الْحَمْوَ قَالَ الْحَمْوُ الْمَوْتُ