some scenes unforgetable after watching

A movie made by northern Ireland, plain, warm, and full of tears unseen and laughters unfeigned/genuine. (better to put the adjective before the noun)
An old man returned to his hometown from the UK and found himeself with nowhere to settle and no relatives and or friends around.
He was not qualified of alms for the pension from the government because he had no fixed address.
He lived in a park and slept in his car.....
And suddenly a boy appeared, just like carl??? broke into the life of the old man in .
The boy cheered him up with his smile, as if stained/painted with the most brightest sunshine of September.
They went swimming to swim, to drive driving (the gerund is preferred to the infinitive) and to church to listen to the piano of an old lady who became friends with them.
There always was something very delicate yet undescribable in those everyday scenes, in their miserable and
homeless life.

In the end the old man fighted fought to gain his rights. He got his home, after the boy died hopelessly and helplessly.
The boy said:"they said I could never learn anything (with the negative never) something"
He said "have you ever watched a leaf falling, in autumn? It's....it's a beautiful thing."
In a reasonable context, he was such a bad lot that his father got all the had every reason to throw him out.
He had done a lot of terrible business but an equal amount of good.
I just cannot forget the moment he broke into his own home, grabbed a pack of milk from the refrigerator......

It is heart-breaking to see him smiling while one already knows/knew what he had undergone and what his fate will/would be.
Not to mention the characteristically innocent eyes of Colin.

I found myself falling in love with his smile and felt that I have to write several lines about this story.