Here's how I see it:
* CDL is the geneologist for her side of the family.
* Aunt had tons of family documents, mostly for her family
* CDL offerrd to sort through all the documents, with the intention of keeping and archiving the documents relevent to her work, which seem to be the lion share.
* Cousin1 did e work of sending the documents to CDL, but didn't seem to have any interest in them
* Cousin2 is the geneologist for uncle's family
* CDL has no use for documents from uncle's family, so offered them to Cousin2
* Cousins 1 and 2 have equal claim to the documents based on kinship
* Now that Cousin2 wants them, so does Cousin1
As far as I see it CrazyDffodilLady did nothing wrong. Maybe Cousin2 should have spoken up at the beginning, but it sounds like the majority of the information was for CDL's family, where she is in charge of archiving the records. She took on the job of sorting through all the information and was never told what to do with any documents that did not interest her. Se made the decision herself, knowing Cousin2 archives for that side of his family. I think she should take pictures for Cousin1, who just wants to "look" after all and send the documents to Cousin2.