I dont get the theme to the story "Where is here" and i need to write a paragraph about the theme

Its a story that tells the journey of an old man who appears on the front porch of a family of 4. The stranger knocks and a man opens the door, the father. He asks what the stranger needs and the stranger explains that the house once belonged to his parents and that he grew up

Explanation:

i agree so i wont repert this question