It is narrated from Ali (ع) that the Prophet (ص) held on to the hands of Hasan (ع) and Husain (ع) and said:
"Whoever loves me and these two, and their father and mother, will be in the same rank as me on the Day of Resurrection"
This is because the one who loves any person will be reunited with that person
Tirmidhi, Jam'i as-Sahih V.5, page 305; Ahmad ibn Hanbal, Musnad, V.1, page 77; Ibid, Fazail-e-Sahaba, V.2, page 693; Khatib Baghdadi, Tarikh-e-Baghdad, V.13, page 289; Ibn Asaker, Tarikh Madinah-Damishq, V.13, page 196; Ibn Athir Jazari, Asad al-Ghabah, V.4, page 29.