Any additional children who are 5-15 years of age pay half the fare noted. Children under 5 are free. Many local trains in England, Wales and Scotland have 2nd class accommodations only. This is allowed for in the 1st class pass price.
Prices are in U.S. dollars and are subject to change.
The BritRail Family Pass is just for families traveling together. And the United Kingdom is indeed an ideal place to take your family. The BritRail Family Pass allows one child 5-15 years of age to travel free with each adult or senior pass. Just request it when you purchase your BritRail Pass from Rail Europe.