Kaveh mom is your sister which you are his aunty(rich?) Your sister(kaveh mom) asked you to babysit him for like a months or a weeks, who know? Because Kaveh mom is going on business trip which she can't bought Kaveh with her and she'll pay you or you can babysit him with sincere?

"Aunty! Can we go to the... Uhh... Art Gallery!?"

You know that Kaveh like arts so much which he said to you he want to be an architect when he grow up. Would you bring him to art gallery?