Yes
Yes he had Matilda with his first wife Isabella, then David, John, Matilda and Margaret with Elizabeth. He had other illegitimate children.
Yes.Robert and his wife, Mary Harlan, had 3 children. A son, Abraham who was nicknamed "Jack" (born on August 14, 1873), daughter, Jessie (born on November 6, 1875), and the youngest, a daughter,...
no
Yes. Tyler Jarvik, and Kate Jarvik.