I'm from Holland and my english is not so good as it should be....apologise.

In January I will visit London with my two children (age 14 and 16). We will walk much as we can,
but sometimes we have to take the metro (or subway, tube, underground how do you call this).
We will stay 3 days from 6th to 8th January. What is smart for us to buy? 10 tickets each for the
metro or a Travelcard or ...?

I've heard that there's a reduction for children. Can somebody tell me what's the cheapest
solution for us?
I don't like links to sites, but I prefer a personal answer.

If you buy a 3-day travelcard for yourself you will be able to buy daily childrens
travelcards at £1 per day for your 14 year old child. 16 year olds are counted as
adults so will need an adult ticket also. A 3-day travelcard costs £18.90.

£18.90 + £18.90 + £3 = £40.80

This works out cheaper for you than using 10 single tickets each or Oyster card.