my father is a spanish citizen and he stayed here in canada for 6 months ( no need of Visa) before he finished his 6 months of staying here in canada, we applied for extension, and fortunately the immigration give him another 1 year to stay here in canada. My question is, this August he is planning to go to US for a visit for just 1 week, and go back here in canada after 1 week vacation in US. So i was thinking if the extension i still valid? because the Immigration gave him until april 2015.