I got a notice that my Grandfather William Bradford is from my Roger's line, but I have looked and cannot find a connection, can you give me an idea how to find which grandmother this comes from?
You should be able to be at the page of William Bradford and in the right upper corner of his Details page, click to View My Relationship on the right upper area of that page. If this does not show any specific relationship, there may be something missing between your name and that of your parents and William Bradford. If this process does not work for you, please re-post your findings in the forum or call the help support number 1-866-406-1830.
Have you been able to access this website? It may have some additional information. If you click on the in individuals name, it takes you to the FamilySearch record, which will let you view your relationship to that person. It may get you further information about your connection.
Good luck learning more about your connections to the Mayflower.