I just replied to you on my thread but I'm writing here too in case you do not check the comment on my thread.
I'm Canadian and my husband is American. We got married 2 years ago and lived in the US following marriage. In September, we came to Canada and we're staying here. I will sponsor my husband as soon as my proof of citizenship comes in mail because I lost it (who knows when that's gonna be, it's been 3 months. sigh!). Anyway, we both had return tickets but at the airport, they didn't ask us when are we going back to the US or how long we're going to stay or purpose of the trip. No questions at all.
Hopefully that's the case with you too. If they don't ask, you don't have to say anything