A man saying, "My son" to someone whose father did not become Muslim

As-Sa'b ibn Hakim reported that his grandfather said, "I came to 'Umar ibn al-Khattab, may Allah be pleased with him. He began to say, 'Nephew.' Then he questioned me and I told him my lineage and so he knew that my father had not become Muslim. He began to say, 'My son, my son.'"

حَدَّثَنَا بِشْرُ بْنُ الْحَكَمِ، قَالَ: حَدَّثَنَا مَحْبُوبُ بْنُ مُحْرِزٍ الْكُوفِيُّ، قَالَ: حَدَّثَنَا الصَّعْبُ بْنُ حَكِيمٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ قَالَ: أَتَيْتُ عُمَرَ بْنَ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ، فَجَعَلَ يَقُولُ: يَا ابْنَ أَخِي، ثُمَّ سَأَلَنِي؟ فَانْتَسَبْتُ لَهُ، فَعَرَفَ أَنَّ أَبِي لَمْ يُدْرِكِ الإِسْلاَمَ، فَجَعَلَ يَقُولُ: يَا بُنَيَّ يَا بُنَيَّ.

Anas said, "I used to serve the Prophet, may Allah bless him and grant him peace." He continued, "I used to enter without asking for permission to enter. One day I came and he said, 'My son, there is a new situation. You should not come in unless you have permission.'"

حَدَّثَنَا مُحَمَّدٌ، قَالَ: حَدَّثَنَا عَبْدُ اللهِ، قَالَ: أَخْبَرَنَا جَرِيرُ بْنُ حَازِمٍ، عَنْ سَلْمٍ الْعَلَوِيِّ قَالَ: سَمِعْتُ أَنَسًا يَقُولُ: كُنْتُ خَادِمًا لِلنَّبِيِّ ﷺ، قَالَ: فَكُنْتُ أَدْخُلُ بِغَيْرِ اسْتِئْذَانٍ، فَجِئْتُ يَوْمًا، فَقَالَ: كَمَا أَنْتَ يَا بُنَيَّ، فَإِنَّهُ قَدْ حَدَثَ بَعْدَكَ أَمْرٌ: لا تَدْخُلَنَّ إِلا بِإِذْنٍ.