I'm not _entirely_ sure of most things, but am unsure how I am to reply with anything of substance if you don't give me a little more to engage with. _Why_ doesn't it make sense? I'm approaching it from a sociological point in this case, rather than a moral or theological one.
Given my only exposure with any depth is Christianity (still superficial) I’m using this as my reference. If you read any of the really well-regarded spiritual authors (like the doctors of the church for example) you will read plenty about how your family (or you, of course) could easily be damned to hell. In fact, seeing relatives in hell is probably inevitable. Something even more discomforting to discuss is that, being that you’ve made it to heaven, your will is united to God’s and you would in fact marvel at God’s justice while you watch your relatives suffer in hell.