Children go free on London Underground..how do I get them through the barriers ?

[recall]

Just wondering how it works, I am planning to use conactless payment, and there are three of them, how do we get them through the barrier things ?

They have larger gates for families, buggies, people with luggage etc, just head to that one. They're usually at the end of the row.

so i use my card - the gates open and we all go through together ? and do I have to scan my card again when we get off ?

Thanks Nickifury by the way

Yes, exactly that.

Put your card on the oyster reader as you go through to get on the train. It's a yellow circle, can't miss it. Then again when you go through after leaving the train.