I have never heard of this and it is kinda creepy IMO. Especially considering the degree of separation.
Apparently some off the wall family member of GMIL took a camera and was taking pictures of the funeral. To include GMIL in the casket as well as various family members around the casket (including MIL and her siblings as they were mourning at the viewing). Dh's aunt said she heard a constant clicking at the grave site but when she turned around could never see anything.
MIL eventually found out that this person has a whole photo album of dead relatives funerals. MIL warned her that if she ever saw a photo of her dead mom she would come after her and she wanted the photos destroyed or erased. MIL was some kind of upset. This woman isn't even a close family member, she is the niece of GMIL's BIL.
"Friendship is born at that moment when one person says to another: "What! You too? I thought I was the only one."
~C.S. Lewis