Although it's seven years after you posted this, I just came across it. I believe your half brother and I might be related. I was Googling my grandfather, Samuel J. Rosch, and saw an Ancestry post by one of my cousins and also yours. My maternal grandfather had a brother named Mordecai who lived in Miami and a sister named Charlotte. One of his sisters lived in Texas, I think. Our family lived in Yonkers, NY, and my grandparents lived there and in their later years in West Palm Beach. I remember when I was very young, I went with my grandparents to visit his brother in Miami. It was very foreign to me because we were very Reformed and they were very Orthodox. We were closer to my maternal grandmother's family because they were also in the NYC area. By the way, I have an uncle named Paul Rosch who was my mother's brother.