Instructions have gone to the field on a number of occasions to reinforce the notion that potential parent and grandparent entrants should be given the maximum amount of time possible and multiple entry visas, if they apply for them. Recently we've made some changes in direction to the field, which Madame Deschênes can expand on, that provide guidance to officers around multiple entry visas and time length.
On October 18th, 2011. See this statement in context.