inviting my family again to visit canada

[MMI]

hello,

my parents and brother had a multiple entry visit visa and went here in canada last 2009 for a short visit. they went back home after 3 months.  and now their visa already expired.  i will send another letter of invitation to them.  however, i am currently unemployed.  only my spouse is working.

would i say in the invitation letter that i am unemployed? what about in the visit visa application form in the family background/occupation portion, would the term "unemployed" appropriate?

what are their chances of getting approved again considering that the one inviting is unemployed?

please help.  thank you.