Hello,
I'm Minnie Tresser's granddaughter. Samuel never married or had children, to my knowledge, he was a boy when he was killed in WWI. Minnie was the only Tresser who had children, who are my mother Myrna, and her brother Samuel, named after Minne's late brother. Samuel didn't have a brother named Morris, but Minnie's husband, Frank Robinson, had a brother named Morris.
So Samuel's siblings are Minnie, Michael, Jack and Lillian.