Mabel and Vinnolia were sisters.  Neither was Wyatt's sister.  Together they recorded Josephine's memiors in what is known by scholars as the "Cason Manuscript."

Mabel's son Walt describes their place in the Earp family tree in the FAQ "How is Mabel Earp Cason related to the Earp clan?"

Walt Cason gives us the answer:

I am the son of Mabel Earp Cason. Her father was William Harrison Earp. His father John Wesley Earp and Wyatt were first cousins.

Mabel was an artist, art teacher and part time writer, mostly of children's stories.  The picture of Mother's probably dated to around 1930 when we lived in Arizona and she painted a lot of desert scenes and exhibited them in hotels and art galleries.

All immediate members of the Earp family, including their spouses, passed away within the United States, although it is possible that a later descendant died outside of America's borders.  Genealogy groups may be better sources for tracking such relatives.

Yes, there are!   The photos are of Wyatt and Josie in the later years.  It is unclear who owns the copyrights to the pictures, though, so the photos cannot be shown here.

A search of the Internet will come up with links to some of the photos.  Better yet, you can watch the PBS American Experience documentary about Wyatt Earp to get a glimpse of some.  The documentary is available to view online at the PBS web site .

There is no evidence that Mattie had a laudanum (an opium-based pain killer) addiction while living in Tombstone.  The idea that she later died from a self-induced overdose of the drug is still a matter of debate.