It is this very concept that seems lost on LDS, who seem to be focused on recreating earth in Heaven, where there will be separate family units. Interestingly, the LDS idea of sealings demonstrates that what is imagined as an eternal family unit doesn’t actually work. As someone already stated, lets say that I am sealed to my wife. We have kids, who are born in the covenant and sealed to us. But then, I’m sealed to my parents, and my wife is sealed to her parents, who are also sealed to their own parents. So how exactly does this idea of an eternal family “unit” work? Who will you be with?
The Catholic view on marriage and Heaven makes all the more sense. Firstly, the Church teaches that in Heaven, besides what I have already mentioned (which focuses on how in deification, we love the way God loves, since we become like Him), our relationships on earth are perfected. We do not forget our spouses, our parents, our children, etc. Indeed, Catholicism teaches in its writings and its liturgies the future of hopefully (if we are all saved) being reunited with our loved ones in Heaven. “Till death do you part”, as understood by Catholicism (and not what you as an LDS want it to mean), does not mean that you will be forever parted from your spouse, or that you will forget who they are. Indeed, “till death do you part” is only one option used in the ceremony. “So long as you both shall live” is another option.
Again, as I already stated, the LDS idea of sealings doesn’t make sense. There is no Biblical nor ancient Christian evidence that eternal marriage is necessary for eternal life. Coupled with the idea of eternal marriage is the LDS idea of “eternal increase”, or that the couple will beget spirit children in the next life, who will have the same relationship to them as we purportedly have with Heavenly Father (and the Mother). Such an idea is utterly foreign to the New Testament and other ancient Christian documents, and was made up by Joseph Smith and others in the LDS movement. Catholics do not need a “sealing” ordinance to know that in the Catholic faith, we believe that we will, by God’s grace, be reunited with our spouses, our children, our parents, etc, live in the eternal presence of God, and love all as God loves, as one family in Jesus Christ.