I am not Catholic. I’m just posting the news, here. Perhaps you should ask your Priest.
My dad has passed on, but when he was alive he was heavily into genealogy and researching family history.
He eventually quit using the LDS-based facilities and materials because he was very much against giving or sharing any information that allowed for proxy baptisms, aka, baptizing the dead.
Here is a Wikipedia article about the practice: http://en.wikipedia.org/wiki/Baptism_for_the_dead
I don’t know a whole lot about the LDS Faith in general, but I have to say that I find this particular act to be deplorable, especially the fact that they have baptized not only plain old Christians and Jews, but also Holocaust victims; former Nazi officials, including Hitler; martyred Catholic saints, and so on.
I am not saying that innocent LDS members are deplorable; only those who allow and/or participate in these actions.
The Holocaust victims and martyred saints bother me the most, honestly, since they died as a direct result of their faith in God.
It's a very clever ruse to get you to feed them information. My former boss is a Mormon 'bishop'. When I complained to him about this incidious practice, he said I could complete an official LDS form stating that I did not want to be baptized in their church. Now that's arrogance!