Read the following passage and solve the questions based on it.
Mintu Babu lives in a smaller house than her brother. Mintu Babu lives in a larger house than her parents. Mintu Babu’s children live with her. Mintu Babu has no other relatives.
Out of all the relatives of Mintu Babu who could possibly be either older or younger than her, none are the same age or older, then, how many of Mintu Babu’s relatives must be younger than her?