Just today i watched a video post by my sister-in-law. Its a video about a relationship between a dad and his son. Its very touching video and beautiful video.
Here is a short conversation between the son and his dad,

son: Dad, can you run a marathon with me?
dad (with heart disease and old age): Ok.
(a few months later..)
son: Dad, can we have another marathon?
Dad: Ok.
(yet a few months more)
Son: Dad, can you join the iron man with me?
Dad: Ok. Let's go for it...

Watch this video.