Siblings. Victorian post mortem photography may seem strange, but for some families it was their only opportunity to have a memento of their loved one as photography was expensive at the time. Sometimes the dead were posed as if alive and sometimes are of children and babies due to the high death rate among this group at the time.
Memento Mori: Postmortem Photographs. This is one of the Charles Van Schaick photographs that was used in the book "Wisconsin Death Trip." It's a portrait of deceased twin infants in coffins: Robert and Janet Fitzpatrick were born on July 5, 1885, and died April 20, 1886. This mourning ritual was widespread in19th-century America - I find it fascinating.