With respect to RESPs, the measure you're referring to is the allocation of RESP assets from one RESP to another. This measure relates to RESPs that are set up not by the parents of the siblings but by someone like an aunt or uncle. When an aunt or an uncle sets up an RESP for an individual, she or he cannot set up a family RESP. They're only allowed to set up individual RESPs. Where one sibling is unable to use the RESP amounts, they were essentially trapped in that RESP. This measure will allow the transfer of RESP assets from one RESP to those of the sibling, as long as the sibling's RESP was set up before he was 21 years old.
On November 1st, 2011. See this statement in context.