The Mormon concept of afterlife denies the oneness of God. Including their own teaching of three gods with one purpose.
I grew up LDS, my entire family and extended family, over a hundred people, are Mormon. Mormon families are just as dysfunctional as non-Mormon families. They (we) just keep a smooth surface going, especially while at church.
Honestly, the closeness of families who attend Mass together, are more admirable to me than Mormon families. Perhaps we are both projecting our own idealism.
(I am Catholic, the only Catholic in my entire family.)