Olya invites Mary to her house

Olya and Mary are schoolgirls. They study in an eleven-year school in Sosnovka.
Olya lives in Green Street. Her father is a doctor. The family lives near the hospital. There are two big houses there. They live in one of them. The house consists of five rooms.
The doctor's family is large. There are six of them: Father, Mother, two sons and two daughters.
One day Olya invites Mary to show her their house and take tea with the family. Mary thanks Olya for her invitation.
It is Saturday. The family is at home.
When Mary comes Olya welcomes her and says, "Good afternoon!"
Mary answers, "Good afternoon!"
Olya introduces Mary to her father, mother, sister and brothers. Before they have tea Olya shows her friend their house.
"This is the dining-room, it is the biggest room of the house. On the right you see Father's study, it is smaller than the other rooms. On the left there is the living-room, it is a little smaller than the dining-room. Opposite there are two bedrooms. This is our bedroom. My sister and I sleep in it. And that is my brothers' bedroom. The rooms are not large but we like them very much.
This is the kitchen and that is our bathroom. And how many rooms are there in your house?"
"We have three rooms. Our rooms are not so large as yours. We have a small house and a little garden behind the house. In the garden there are many beautiful flowers and beds with vegetables."