How many kids did Albert Einstein have with his second wife?

Answer 1

Einstein's second wife Elsa had three children with her first husband. Her son died in infancy, but her two daughters lived with her and Einstein; they were already related to him by blood (Elsa and Albert were both first cousins... their mothers were sisters... and first cousins once removed, as their fathers had also been first cousins) and took the last name Einstein. They didn't have any children together.