Describe the relationship that the people in the photograph have.
They live be at it oldest woman.This is secret because she doesn't pay a tax from rent. 0
They live in the old lady's house. It is a secret though as she wants to avoid paying tax after the rent.
I presume that is what you wanted to say. Something like 'The girls are twins. The boys are friends. The ladies are aquiantances.' would have been better.
I agree with Szilards corrections , BUT you still did ok ;o)