canadianwoman's reply is correct - "dependent" children (according to CIC's specifications of dependent) are the only ones included as applicants, whether they are coming to Canada or not. They need to be medically examined, and they need to provide criminal clearances if they are over 18 years of age. Parents and siblings info is provided in the Additional Family Info form, but parents and siblings are not eligible to be sponsored, so are not included as "applicants".