The parents have the option, if they're planning to return to Canada to live, of sponsoring the child for permanent residence in Canada. Once the child becomes a permanent resident in Canada there's no waiting period; they can immediately apply for citizenship.
Evidence of meeting #40 for Human Resources, Skills and Social Development and the Status of Persons with Disabilities in the 40th Parliament, 3rd Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was adoption.
A recording is available from Parliament.