Marie Gordon's brother was Leopold (Leo) Gordon. Leo Gordon married Adele Schwartz. Their son Louis Gordon is my father Louis Gordon, who married Anita Katchen. Their two sons are my brother Alan Gordon and myself Joshua Gordon.
Addition
Marie Gordon's brother was Leopold (Leo) Gordon. Leo Gordon married Adele Schwartz. Their son Louis Gordon is my father Louis Gordon, who married Anita Katchen. Their two sons are my brother Alan Gordon and myself Joshua Gordon.