Here's why:
* "Us" is the direct object of the verb "show." It's what is being shown.
* "Pictures" is the object of the preposition "of."
* "Your old house country" is a confusing phrase. It seems to be trying to combine the ideas of a house and a country, but it's not clear what it means.
To fix the sentence, you could use one of these options:
* "Show us pictures of your old house." This focuses on the house itself.
* "Show us pictures of the country where your old house is located." This clarifies the intended meaning.
Indirect objects receive the direct object. For example:
* "Give me the book." "Me" is the indirect object because it receives the direct object, "the book."