Meeting Folks

One of the coolest parts of traveling is all the people you meet along the way. The first folks of this trip are a Filipino family at the Edmonton airport. Four people a dad, mom plus a young daughter  5 years and son 2 years 4 months. They are all headed to some place 9 hours bus ride from Manila. Nice friendly people as most Filipinos I have met are. The young boy who is maybe is not speaking yet which has to be worrisome to the parents. What age do children usually stat speaking?