William McFly (back row, center) and family.


McFly family members had a tendency to share the same habits.

The McFly family was a large family of mostly Irish descent. Members of the family were generally bullied by non-Irish peoples, in particular another lineage, the Tannen family.


The McFlys had arrived in America in the late 1800s with Seamus McFly, his brother Martin, and Seamus's wife Maggie heading for the West Coast.

After Martin was stabbed to death with a bowie knife during an altercation in a saloon in Virginia City, Nevada, Seamus and Maggie moved on and settled in Hill Valley, California. In 1885, Maggie gave birth to her first son William Sean McFly, the first McFly born in America. From there, the McFlys would create a large family that was notable to make A History of Hill Valley, 1850-1930.

Over the next century, the family continued to reside in Hill Valley, albeit under control of Biff Tannen in the alternate timeline. Marty McFly would make the greatest contribution to his family's history by going back in time to 1955 in Dr. Emmett Brown's DeLorean time machine and inadvertently changing events though he would intentionally change the events back to the way they were the second time around. Marty's continued actions would benefit him and his family into the future, well beyond the year 2015.


  • A recurring theme the franchise is that if there is a McFly somewhere in history, there is always a Tannen, giving that McFly grief.
  • According to Ziff Tannen, the McFlys have pushed around Tannens in history.[1]
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Family tree[]

                       Harold McFly + Jennivere McFly (1300s-?)
                |                                       |
Hill Family  Seamus McFly + Maggie McFly (1880s-1900s) Martin McFly
     |                    |                             
Eliza Hill McFly + William McFly (1885-1995) Pee Wee McFly (1874-1897) 
     Jim McFly Arthur McFly + Sylvia McFly (1936-1950s)     Baines family
                            |                                     |
                         George Douglas McFly + Lorraine Baines McFly (1958-???)
  Parker family         +--------------------------+--------------------------+  
        |               |                          |                          |
Jennifer Parker + "Marty" Martin Seamus McFly "Dave" David Tiberius McFly Linda McFly
       |                   |                                  
Marty McFly, Jr.   Marlene McFly
 Marty McFly III           
  Marta McFly                                                                                                                                                                                                                                  

Notes and references[]