yes the same form you used for your wife all them years ago.. - as they are under 18, they will be dependents of your wife, so you'll probably need to co-sponsor them, does your wife work?

is the father named on their birth cert ? who have they been living with for the last 5yrs? do you send money to them ?

you need to prove your wife has 'sole responsibility ' for them, could be a problem after living 5yrs apart.