According to "McElyea's in Transit" by Clara Hunt Miller, Elmer was the son of Richard Lindsay McElyea & Ethel Beulah Waters. Richard Lindsay McElyea was the son of Lindsay Thomas McElyea & Mary Emeline Allison. Lindsay Thomas McElyea was the son of John W. McElyea & Elvira B. Jones. John W. McElyea was the son of Samuel McElyea. Samuel McElyea is believed to be the son of Patrick Henry McElyea. Patrick Henry McElyea was the son of Laughlin McElyea & Mary Powers, believed to be the first McElyea to come to the United States.