"There are religious differences," one [source] points out. "Would he expect her to convert to Judaism?"
Lauren's mother, Sharon, is a devout Christian.
The Daily News did find one Bush insider to dispute George and Barbara Bush's disapproval of Lauren, and to point out that even the elder George Bush didn't get to invite siblings.
NB to David: If you do get invited, don't bring up Grandpa Prescott. So awkward.