Thanks javier, I didn't realise I had a proper sequence of the same family until I got home and looked through the 500+ photos that I took that day.
Actually there is a twist to this little seven photo story, some extra photos I found from later in the train trip which appears to be in contrast to the happiness and familial theme of the previous shots.
The following shots seem to show loneliness. He's almost in a foetal position, almost. Or alternatively the images could show introspection or prayer.