Iasha,
Is this your post from 2012? "My wife has landing papers since 1997, she was eligible for citizenship in 2001, my son has his since 1998. We left north America in 2003, to work in the gulf area and we went never back. I'm a Canadian citizen and I do not know the validity of their landing long sheet , it's probably invalid any more, how can get them PR card? Are they allowed to enter Canada with what they have right now? If I have to re-apply for them what are the forms etc."
If you were a Canadian citizen the day you left Canada 2003 and your wife and child lived with you since you left in 2003, then they have maintained their PR status. Everyday a PR lives or travels with their spouse or parent who a is citizen, then they meet the residency requirement for everyday they are with the Canadian citizen parent or spouse outside of Canada. Does this make sense?