The Dads name is Ben Nunery, and he lost his wife to a rare form of lung cancer. So, before he and his 3 year old daughter moved out of their home he decided to take some final photos.
If you click on the link in the Tweet above you can see the rest of the pictures and find out a little bit more about the story.
***WARNING*** You will probably cry when you read the story, but it's well worth the read and tears. The story is very touching!