It depends upon the age of your children:

1) Any child over the age of 12 is considered as an adult by the travel agency and hotel industry, thus will no longer get any discount.
2) Children who are under 12 years old can get 50% discount for the flight booking. For hotel booking, stay for free in their parent's room using the existing bedding, requirement for an extra bed will occur extra charge.
3) Children no more than 2 years old pay only 10% for the flight booking. Free baby cots for babies in the hotels.