Oh... um... I mean look, it's a bit controversial.
They document family trees, and then post-humorously baptize the dead so everyone's kin can get to heaven.
They mean well, and it's coming from a good place, but it's a little weird and it can be off-putting to know that they don't think any other religion's baptisms count so they have to do it over the LDS way. But look, they mean well.
But basically instead of just "Oh, we're just saying some prayers for your dead granny..." -- which I think everyone would be fine with, it's the Mormons saying, "Oh, we're saying some prayers for your dead granny... because without true Mormon salvation she'd be burning in hell forever."
The Mormons also have "stand-ins" that they baptize in place of the person. Usually kids. So a kid goes up and says, "I'm so-and-so, grandmother of such-and-such..." and then they get dunked in a tub. And it also serves to further indoctrinate the kids... who are re-baptized a bunch of times.
My view... all religions are nutty. Not sure where we draw a line on any of them. But I don't really care what people do in the privacy of their own temple, or what internet archives they want to spend their time transcribing. If it lets them sleep a bit better knowing my dead great grandmother is with her family in Heaven... that's great. Or at least, it's no going to hurt her any. (=
First, Latter-Day Saints believe that one needs to be baptized in order to enter into heaven (based on the teachings of Jesus Christ recorded in John 3:16). For this to come about for those who never had the opportunity to be baptized (let alone the countless individuals who never even heard of Jesus Christ while alive), they perform proxy baptisms on behalf of dead individuals. Obviously they don't baptize corpses; instead, they have a member of their faith baptized again, on behalf of an individual who has passed away.
To find out who of their family tree needs to be baptized, Latter-Day Saints perform tons of genealogical work, which includes indexing handwritten censuses into digital form. Hence the census sheets.
They document family trees, and then post-humorously baptize the dead so everyone's kin can get to heaven.
They mean well, and it's coming from a good place, but it's a little weird and it can be off-putting to know that they don't think any other religion's baptisms count so they have to do it over the LDS way. But look, they mean well.
Some background on the controversy.
https://www.nytimes.com/2012/03/03/us/jews-take-issue-with-p...