LDS stands for "Latter-Day Saint" which is short for a member of "The Church of Jesus Christ of Latter-Day Saints"....commonly called the Mormon church.
That's cool you're in an open adoption...that will make telling them a lot easier. Be prepared for them to be uncomfortable with the openness though. My in-laws are and so I really don't share bfam news with them so much. I think they're old school and scared of "bfam kidnapper" scenarios.....
