A couple of years ago, I came across a posting that you had made in 1999 on a genealogy forum regarding your mother Mary Bokor.
My mother and grandmother were Bokors.I have been able to find information regarding them on the Ellis Island database.It can be found at www.ellisisland.org.I did do a search for both Sander (Alexander) Bokor and Maria (Mary) Bokor.I had hits for both names in the early 1900's however nothing in 1913 or in the same year for both names.I wasn't able to find Susan.
You mention that you have an aunt named Rose.My mother immigrated with her mother Theresa and her aunt Rose Bokor in 1921.Since the other names don't match, alas, I think that it was a different Rose.
You might also be of interest to know that there was a Rosa Bokor who arrived on Ellis Island in 1913 at the age of 25 giving New York as a place of residence.
I don't know if any of this has been at all helpful to you, but there it is.