Most importantly, life has changed drastically since Babbage allowed us all have laptops at home. The days when we all referred to the Encyclopedia Britannica or the local Reference Library for our information have long gone. These days the click of a mouse brings forth more information than we could ever have imagined; on any subject.
We no longer take our exposed rolls of 35mm camera film to Boots; the digital age means that the photographic department of the nearby Chemist is now defunct, and the processing of our holiday snaps takes place in that same all-powerful laptop.
Furthermore, that telephone in the hall is now hardly ever used, as everyone (except me) carries a small hand-held mobile device that does just about everything. We can even speak to, and see, each other across the world for FREE.
TV's are now flat, and you can change channels without having to leave the sofa!
If I'd told them that their lovely thatched Sussex house, that they bought back in the late 60's, is now worth a bloody fortune; they would have laughed in my face.
Cars now drive themselves (without petrol). Houses create their own electricity through roof-mounted solar panels. Woolworth's no longer exists. Big Ben no longer rings, due to lengthy renovations. Having joined The Common Market in 1973, we then quit the EU in 2020. Some people now live on takeaways of beefburgers and cola, which are consumed whilst watching TV. Millions of Asian and Middle Eastern immigrants now live in England, and have created their own communities. And I am still living in France.
Your 3 grandchildren have all done well. One lives in London, one in Oz, and one presently in Holland. You also now have 6 great-grandsons, but no granddaughters; each of your grandchildren has two boys.
Not all has been good since you left. There have been several unnecessary wars in Iraq and Syria, and the USA currently has a bizarre orange-faced TV personality and property owner as its President (no comment).
We are also currently in the midst of an extremely nasty worldwide pandemic known as COVID-19.
Otherwise, my sister and I are both well. We both live adequate lives; both still in our chosen countries, and we have both also followed in the family tradition of becoming diabetics.
I know you would have loved modern communication; mostly for Email and chatting on Skype, and I'm pretty sure you'd have joined the millions who buy stuff 'online' from a Co called Amazon.
The world is quite different now, and I think, mostly, you would have enjoyed it. I'm just sorry you aren't both here to see for yourselves.