Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 182

وَعَنْ أَنَسٍ قَالَ: سُئِلَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: أَي بَيْتِكَ أَحَبُّ إِلَيْكَ؟ قَالَ: «الْحَسَنُ وَالْحُسَيْنُ» وَكَانَ يَقُولُ لِفَاطِمَةَ: «ادْعِي لِي ابْنَيَّ» فَيَشُمُّهُمَا وَيَضُمُّهُمَا إِلَيْهِ. رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ غَرِيبٌ

Anas told that when God’s messenger was asked which member of his family was dearest to him, he replied, “Al-Hasan and al-Husain.” He used to say to Fatim a, “Call my two sons to me,” and then would sniff and cuddle them. Tirmidhi transmitted it, saying this is a gharib tradition.