I am in UK on Tier 2 general visa and am planning to apply Tier 2 dependent visa for my wife and kid soon. I got the clarity that i have to pay 200 GBP per year as surcharge for my wife

Does it apply to my kid as well?
I have read in some forums, the below one is in the the exempted list. does it apply to all the children?
Children under 18 years taken into care or in the care of a local authority
link to that site.
http://www.newlandchase.com/nc_news/art ... _in_the_uk
thanks
jk