请问：大人在伦敦买了oystercard后，孩子就不用买

我上oystercard官网上看到说

Your child doesn't need an Oyster photocard:

•To travel free on buses and trams

•To buy child-rate cash single and return tickets or Day Travelcards

•If they're with an adult who has a valid ticket, Freedom Pass, 60+ London or Veterans Oyster photocard, or who is using pay as you go (up to four children per adult)

所以，我的理解是我和老公各买一张oystercard后，我孩子就可以免费乘坐地铁了，对吗？

有没有过来人confirm一下？