Canada / Canadian citizenship

There are also factors specific to your situation that need to be considered, so rather than guess what they might be, I'd recommend visiting the Canadian Government's web site on this topic... http://www.cic.gc.ca/english/index.html

1.Yes-

"Canadian citizens and permanent residents living in Canada, 18 years of age or older, may sponsor close relatives or family members who want to become permanent residents of Canada. Sponsors must promise to support the relative or family member and their accompanying family members for a period of three to 10 years to help them settle in Canada"

2.Yes-

Applying as a Sponsored Immigrant
If you wish to become a permanent resident of Canada, your relative or family member in Canada must first apply to sponsor you. You must be one of the relatives or family members listed above to be eligible for sponsorship.
Both you and your sponsor need to sign a sponsorship agreement. The agreement outlines your mutual obligations. Your sponsor must promise to support you and your family members financially for three to 10 years so that you will not need to apply for social assistance. You must promise to make every effort to become self-supporting (unless you are elderly).
 
3.Yes-but you have to sign the sponsrship agreement first.Applications for Sponsorship and Immigration to Canada from Abroad
Before your relative or family member can immigrate to Canada, you must sponsor that person. Your relative or family member must then apply for immigration. Learn more and print the information guides and applications you need for sponsorship and immigration.
source:www.cic.gc.ca

check out this link for more information

http://www.gate7i.com 

I have applied for citizenship. I became a canadian residence since 2003, and i was in and out of canada for last four years. Few months ago i applied for citizenship and when i filled out the application i did not mentioned i was out of canada at all. A few days ago, immigration office contacted me to go and have a interview. They found out that i was out of canada at lease four times and i did not write them on my application form. They said they are going to send me a letter and let me know their decision. Any thout?