How many ways can someone be related? I am still counting. My Great, Great Grandparents;John and Mary Allen were married. But in my Whitman research, they also each descend from Samuel Allen, the immigrant. Today as I post lineages to Doctors and Ministers, I find then also sharing descent from Dr. Richard Palgrave. I know I have another lineage that they share as well. I remember running into it as I researched years ago and thought it odd but never wrote the link down. I hope to run into it again. You can sometimes find that a couple married into their own descended family but multiple times is unique!
P.S. Further research shows they also share descent from Rev. William Thompson, as well as Rev. Edward Palgrave.