Trying to find William Robert Riding Greenhalgh

William R R Greenhalgh sailed from Liverpool on 28th December 1912 to the U S of A he was my Grandfathers brother but we never heard mention of him in conversation, ever. This info was passed to me by Peter Greenhalgh(England)but I have no other information. If anyone has any other knowledge of him I would be really grateful. I do have a Postcard that he sent on his arrival, from New Jersey.