Fill in the blanks

[Cherry Popper]

I need some help filling in the blanks.

I know these:

Landlady = mother
roommate = sister

What is:

Aunt = ?
Cousin = ?
Niece = ?

Is there a generally accepted standard for these?

 

[AdventAnyx]

 

[kytee]

Mother = Landlady
Sister = Roommate
Aunt = Landlady's sister
Cousin = Roommate's cousin
Niece = Roommate's daughter

 

[Cherry Popper]

Mother = Landlady
Sister = Roommate
Aunt = Landlady's sister
Cousin = Roommate's cousin
Niece = Roommate's daughter

Thank you!