Heaven is horrible place , change my mind

Heaven sounds horrible to me, How could you be in bliss in heaven after death while your own child is suffering in hell? How could anyone be truly happy in heaven knowing that their child is being tortured in hell?

second opinion is lets imagine a mother and child are killed in the street. The mother was an atheist but a good person. The child goes to heaven and asks, ‘Where is my motherr?’ An angel of god answers that she is in hell because she did not believe in jesus. At the same time, the murderer of them is in heaven because he repented and believed in Jesus. is this justice? (sorry for bad english it is not my native)