I have several LDS friends, and we have never actually discussed the polygamy beliefs. I suppose I thought it was resolved since it is no longer taught (mainstream) for those still living. It is an interesting theological concept.
Mainstream Christian theology teaches that there is no marriage in heaven. Mostly based on Jesus’ comment:
“For when the dead rise, they will neither marry nor be given in marriage. In this respect they will be like the angels in heaven.” — Matthew 22:30 NLT
I think heaven is an interesting topic, in general, because we are promised a new body. Does that mean we’ll all be the same “body age”? Like, will we all look like we’re in our 20’s? So, will our kids look like our siblings?
Really interesting read, and I can see where this would be an important doctrine to iron out for the status of marriages on earth.