Marvin Weinberg, 84, of Farmington, died August 28. He was the widower of Marguerite (Perez) Weinberg. Born in New London, he was the son of the late Louis and Sarah (Yosellefsky) Weinberg.  He served in both the U.S. Air Force and Air Force Reserves.   He is survived by his children, Sheila Reiner and her husband Michael of Farmington, and Brian Weinberg and his wife Nancy of West Hartford; his grandchildren, Sarah Katz and her husband Evan, Jacob Reiner, and Samuel and Danielle Weinberg; his brother Lawrence Weinberg and his wife Mary Anne; and his sister Lynn Blank.