I have eight children by my loving and forgiving wife, Rochelle. I have eight siblings with all nine of us the children of one mother and one father--my parents. There are no plural marriages in the LDS church, so no issues of the kind you asked about. I don't know how it was for the people who were asked to practice plural marriage during 1840-1893, and it was not all the members, just a certain few.
So if you're curious about "polygamy" or "plural marriage", I am not the person to ask. If you're curious about monagomous marriage and how it is and how it becomes a building relationship toward heaven, then I can answer questions about the latter.