Read the following passage and solve the questions based on it.
Pankaj, Qureshi, Rajesh and Sudhir live together in a house.
(i) Pankaj lives with his (or her) parents.
(ii) Qureshi lives with at least three persons younger than him (or her).
(iii) Sudhir lives with his mother, and is older than at least two persons living with him.
(iv) Rajesh lives with his (or her) son and is not older than Sudhir.
The total number of persons in that house is ___.