This is where I got married. Isn't it gorgeous? And look at that handsome guy!
Mormons believe that if they are "sealed" to their families in the temple, then they will be "together forever", meaning they will not be separated after death. This is one of the very best doctrines of the church. Who doesn't want to be with their loved ones for eternity? So we're taught that we can have this wonderful blessing IF we're worthy, and that means a few things. First of all, we have to get to the temple and be sealed to each other to begin with. After that, we have to keep all the commandments, AND we have to hope that all of our loved ones do the same thing, because guess what? If they aren't worthy to go to the celestial kingdom, they won't be there, regardless of how righteous you are. If your dad or husband or child decides that he doesn't want to pay tithing, or he likes a cup of coffee in the morning, or maybe he just straight up doesn't believe this stuff, you're kind of out of luck. It doesn't matter if he is an honest, loving, hard working, giving, wonderful person. You will not be with him after you die. That's according to the doctrine the way it is strictly laid out.
Now, I understand that there have been a lot of statements from church leaders that soften this doctrine. There's a popular one from Joseph Smith. I particularly like this one from Brigham Young:
“Let the father and mother, who are members of this Church and Kingdom, take a righteous course, and strive with all their might never to do a wrong, but to do good all their lives; if they have one child or one hundred children, if they conduct themselves towards them as they should, binding them to the Lord by their faith and prayers, I care not where those children go, they are bound up to their parents by an everlasting tie, and no power of earth or hell can separate them from their parents in eternity; they will return again to the fountain from whence they sprang." (quoted in Joseph Fielding Smith, Doctrines of Salvation, comp. Bruce R. McConkie, 3 vols. [1954–56], 2:90–91).
What I do hope is that Brigham Young's idea applies not only to children, but to spouses and parents and the whole human race. And pets! Because what I really hope is that there is a life after this one and families will be together there. I hope this is true regardless of what they believed here, or what building they were or were not in on Sunday (or Saturday) mornings. The loving Father I hope exists as our God would never separate people from their families based on choices they had little to no control over. He wouldn't separate families based on what belief system they happened to be born into or randomly encountered in this enormous world and throughout our very long history.
He wouldn't separate families. Period.
Being agnostic, I believe that we can't really know any of this one way or the other (at least not in this life). And since I believe that hope/belief is a choice, this is what I choose to hope:
Families are forever. No conditions.