At present, the waiting period for petitions filed by US citizens for a sibling born in Canada is approximately 13 years before the priority date becomes current and a visa application can be filed. Your boyfriend can immigrate with his mother at that time if he remains unmarried and is still under 21 years of age on the date that a visa number becomes available, unless his age can be adjusted under the Child Status Protection Act that took effect on August 6, 2002.
Answered on Apr 15th, 2014 at 8:28 PM