How Can We Find Happiness in Heaven if Someone We Love Goes to Hell?

You are thinking very much inside the box. You can’t do that when you think of heaven. It’s not just another earth-like human situation with clouds and pastel cherubs added. What you need to do is to ask yourself if you really think heaven is for God’s sake. I mean this literally. It’s all about God. God is infinite goodness, goodness without limit, pure unlimited love. This is something beyond any experience we are capable of imagining at this time.