Any Muslim who loses three children
The Prophet (sal Allahu alaihi wa sallam) said, “Any Muslim who loses three children before they reach the age of maturity, will be granted Jannah by Allah, the Exalted, out of His Mercy for them.”
[Sahih Al-Bukhari and Muslim]
We benefit from the above Hadith that the person, who patiently endures the loss of their children and expects reward from Allah, will enjoy the privilege of being granted Jannah (paradise) by Allah.
Allah will have mercy on such people and admit them into Jannah owing to His Mercy towards these innocent children.
And Allah knows best!