The fact is the only possible reliable sources for the kind of information you put out there would be either George W. Bush or Laura Bush themselves, because your claim is of an extremely personal nature, and of course, only they know what goes on behind closed doors in their relationship.
Sometimes it's best to just admit that you had no idea what you were talking about and drop it. This would be one of those times.
They are not Rob and Laura Petry. They don't have to be.