It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "Whoever has three children who die before reaching the age of puberty, Allah Almighty, by His special grace, will surely admit that person and those children into Paradise."
Hadith Referenceالادب المفرد / كتاب / 151
Hadith Gradingالألبانی:صحيح
Hadith Takhrij«صحيح : أخرجه البخاري ، الجنائز ، باب ما قبل فى أولاد المسلمين : 1381 ، 1248 و النسائي : 1873»
Explanation & Benefits
Shaykh Maulana Usman Muneeb
Benefits and Issues: That is, Allah Ta'ala, due to His grace and mercy upon these children, will also admit their parents into Paradise, provided that they are neither polytheists nor usurpers of the rights of others.
Source: Fadlullah al-Ahad: Urdu Commentary on al-Adab al-Mufrad, Page: 151