What is heaven like?

I have some specific heaven-related questions, and I didn’t want to derail @Cruiser’s question.

- If my grandfather died after suffering from cancer and withering down to 90 lbs, will that be the way he is in heaven?
– If a baby dies days after it is born, is that the age it is in heaven? Who has been caring for it all of this time? And will the parents get to raise it and watch it grow up, or will they have to carry that baby around in a sling for eternity?
– Are people walking around in heaven all mutilated from the way they died?
– Is it awkward if your spouse dies and is waiting around for you to join him, but when you do join him, you arrive with your new spouse? Do things get all multiple-spousey?
– Are people getting it on in heaven? If so, can they get pregnant? Has there ever been anyone born in heaven?
– If embryos are people, is heaven littered with embryos? Does it smell?
– Can you opt out?

This is just a start. I’ll ask some more shortly. Thanks.