Hi! If Edgar Lincoln & Emma Lion are your grandparents, you are related to Jules Lion the artist. I have a lot of info on him. A French genealogist found out that his father was a German Jew. Guess you know that Emma's father was Emilien Jules Lion. I have been in contact with a couple of your great aunt's relatives. It is so nice to compare notes. If you are interested, look on my family tree and you will find pictures of Emma's brother, Jules, who was my husband's grantfather.
Hope to hear from you again.
Audrey