I'm not familiar with any "5 children" recommendation in the Mormon church. Maybe that's just where the Mormon wives you known (or their husbands) have just said "No MORE!". As far as I'm aware, Mormon women and men are supposed to have as many children as possible.
After they die, in the Mormon afterlife, if they are worthy, the men are sort of patriarch-Gods on their own actual planets somewhere in the universe. Their extended families are there with them and populate the planet, sons, daughters, grandchildren, etc. So, you want as many as humanly possible. They used to have multiple wives to create whole populations.
exmormon.org
"Then will they become Gods...they will never cease to increase and to multiply, worlds without end. When they receive their crowns, their dominions, they then will be prepared to frame earths like unto ours and to people them in the same manner as we have been brought forth by our parents, by our Father and God” Brigham Young, Journal of Discourses 17:143 |
