When I was born, five of my great-grandparents were still alive and another had only just died. Three of my grandparents were very interested in their families, either writing things down or giving me details for a project I did at school in 1972. My paternal grandfather was less talkative/interested, but his wife (my grandmother) knew a lot about his family and there was also a family bible. All this meant that I could be very confident about all sixteen of my great-great-grandparents at least.
My wife's parents knew their own grandparents well and were fairly confident about the previous generation. However, as far as these pages are concerned, I have assumed nothing beyond each of our great-grandparents, so will prove the connection from all sixteen to each of their own grandparents (the 64) and, where possible, the previous generation.
Each name links to the evidence.