Hadith No: 1
Ibn Hajar al-Asqalani - Al-Matalib al-Aaliyah bi Zawa'id al-Masanaid al-Thamaniyah - Book of Virtues
Chapter on the Virtues of Fatimah (peace be upon her) over her Father and Ali (peace be upon them) and the Superiority of her Sons (peace be upon them)
Volume: (16) - Page Number: (155)
3949 - Abu Bakr said: Zayd ibn al-Habbab narrated to us, from Isra'il, from Maysarah ibn Habib al-Nahdi, from al-Munhal ibn Umayr, from Zurr ibn Habish, from Hudhayfah, who said: "I came to the Messenger of Allah (peace be upon him and his holy progeny) and prayed the Maghrib prayer with him. Then he stood and prayed until he had completed the 'Isha prayer. Then he went out, and I followed him. He said: 'A angel presented himself to me and sought permission from his Lord to greet me and give me glad tidings that Fatimah is the Mistress of the Women of the People of Paradise, and that Hasan and Husayn are the Masters of the Young Men of the People of Paradise.'"

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Reference: Al-Mataaleb al-Aaleyah BeZawaaed al-Masaaneed al-Samaaneyah Book 16

Hadith No: 2
Ibn Hajar al-Asqalani - Al-Matalib al-Aliyah bi Zawa'id al-Musanid al-Thamaniyah - Book of Manaqib
Chapter on the Virtues of Fatimah (peace be upon her) over Her Father and Ali (peace be upon them) and the Excellence of Her Sons (peace be upon them)
Volume: (16) - Page Number: (196)
3965 - Abu Bakr said: Al-Awqos narrated to us from Abu Ishaq from Ali, who said: The Messenger of Allah (peace be upon him and his holy progeny) said: "Al-Hasan and Al-Husayn are the Masters of the Young Men of the People of Paradise." Its narrators are trustworthy.

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Reference: Al-Mataaleb al-Aaleyah BeZawaaed al-Masaaneed al-Samaaneyah Book 16

Hadith No: 3
Ibn Hajar al-Asqalani - Al-Isabah fi Tamyiz al-Sahabah - Supplement to the Letter Meem
Part Four: Those Mentioned in Error Among the Companions Whose Names Begin with Meem - Meem Followed by Aleph - 8498: Malik ibn al-Hasan
Volume: (6) - Page Number: (252)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Al-Baghawi also narrated it in the biography of Malik ibn al-Huwairith al-Laythi as another hadith from this chain, the gist of which is: "Al-Hasan and al-Husayn are the leaders of the youth of the inhabitants of Paradise, and their father is better than them."

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Reference: Al-Isaabah Fi Tamyeez al-Sahaabah Book 6

Hadith No: 4
Ibn Hajar al-Asqalani - Tahdhib al-Tahdhib - Chapter on the letter Ha - Those Whose Name is al-Hasan
528 - al-Hasan ibn Ali ibn Abi Talib al-Hashimi
Volume: (2) - Page Number: (295 > 297)
[The text is lengthy, so only the relevant excerpt is provided here]
528 - al-Hasan ibn Ali ibn Abi Talib al-Hashimi, the grandson of the Messenger of Allah (peace be upon him and his holy progeny) and his delight in this world, one of the two masters of the youth of Paradise: .... Abu Sa'id al-Khudri and several others narrated from the Prophet (peace be upon him and his holy progeny): "Al-Hasan and al-Husayn are the masters of the youth of Paradise," adding that "their father is better than them."

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Reference: Tazheeb al Tahzeeb Book 2