Your spouse in Heaven

Many Christians (and, I presume, believers of other religions) believe or hope that they will somehow get reunited in Heaven with their family and other loved ones after they die and get the thumbs-up by their god.

I have often wondered how they will recognize each other. Will they meet the child person, adult person, or perhaps the demented old-age person?

Today, another question popped into my otherwise unoccupied mind:
When your spouse dies and you then marry someone else (and perhaps your new spouse also dies and you marry a third time...), and when you all have died and made it to Heaven, will you have two (or three or more) spouses then? Isn't that polygamy?

What does practical theology suggest here?
What do the common religious folks think?
What about girl friends or boy friends who died before they could get properly married?

A suspicion creeps upon me that says that the believers haven't thought this all quite through, or perhaps the thought of being 100% preoccupied with praising god and not having any time or concern for private time with your risen loved ones is appealing to them...