LDS is a massive multinational religion (and financial stockholder)
Mormons "baptise the dead", thereby further bumping their numbers.
That is why Mormons hoard genealogy records, using the names and birth dates to symbolically "baptise the dead" posthumously.
Very likely they have baptised some of your deceased kinsfolk; if so, Mormons will "undue" a said baptism only by official request of a surviving relative.
Wacky stuff.