I'll answer this first because nobody else has, and then move on from here. His 20 year old daughter: a dependent is defined as the "child" of an applicant who is under the age of 22 and not married or in a common-law relationship. Even if he wasn't still paying child support, she falls within the definition of a "dependent" if she is not married or in a c/l relationship - so she has to submit to a medical examination (whether coming to Canada or not) and she also has to provide FBI and State criminal clearances because she is over the age of 18. This is where I will caution you. IF she has been in any trouble since becoming a legal adult email or PM me. I have experience with this stuff.
Financial requirements: there are no minimum income requirements for spousal/common-law or conjugal partners and their dependent children, as long as the dependent children have no children of their own.
For the rest of it - believe me,
we agree with you - but they won't. You need to read through the definition of what a "conjugal partner" is in the
OP2 Processing Manual - Section 5.44-5.47. The "conjugal partner"
qualification is about CIC waiving the one year cohabitation requirement for common-law qualification because the couple is
prevented from marrying (or living together) due to fear of persecution or immigration barriers that disallow them from marrying, or establishing a common-law partnership by living together. There are not very many, if any, US/Canadian couples who could not, at some point, get married. Even same-s*x partners are now free to marry in Canada - and divorce is not prevented in either country - so from CIC's standpoint, if you're Canadian and he's American, you CAN, at some point, marry. It makes no difference to them whether you
want to marry or not, and even though a Supreme Court decision mandated that they cannot force people to marry in order to qualify to immigrate, they do require then that you establish a common-law relationship by co-habitating for at least one continuous year.
You DO have to
qualify in the class you're applying in - according to
their interpretation of the definition, and the biggest disadvantage any of us has is that we're not given an opportunity to discuss this, or argue our point, short of appeal (more on that later). They make the determination - there is no room for our viewpoint and no forum for even explaining why we think we qualify in any category. They don't care if we think we qualify - they decide.
Technically a US citizen is only allowed to stay in Canada for up to six months, and vice-versa, but they already know that they're not enforcing that - so they're not going to buy "immigration barriers" from a US/Canada couple. Basically, if you can marry, you're expected to do that . . . they don't really even care if you can't live together and they especially don't care if it's a financial hardship for one of you to live with the other and not be able to work. I've seen too many US/Canada couples refused conjugal partner sponsorships and it becomes nothing but a big money grab on the part of CIC. As far as winning on appeal - forget it. You probably could, but we had an application refused through Buffalo and it took us 2 years just to get to our appeal hearing - and now, having won, we have to wait for who-knows-how-long for Buffalo to reprocess our entire application. Another waste of time and money. You don't say anything about future plans to marry, etc., and nobody here is going to make that judgment but the reality is that if you do intend to marry at some point, do that first and then apply to sponsor him. You'll save yourselves a lot of headaches
and heartache.