Hi, we did something similar. We arrived in September 2017 my husband and one of my child are Canadian Citizens and my other 3 daughters and me are Chiliean. We apply for our eTA was immediately aproved then when we landed in Toronto the officer ask to us about our trip and my husband was clear. We are moving he said!. (My heart was running) he explained that we will be submitting our application for spousal sponsorship Inland soon as possible he found a job in Toronto. And also the officer ask about if we have a house in Chile and we have one and ask about money and we said the truth we bring enough money to paid for our rental house and all our needs. And we was in. But I was very nervous.
Bad situation now is we didn't submitt our application for sponsorship yet but we are working on it, but my visitor status will be expiring soon in march and I don't know what to do!! I read that I can extend my stay..but I want to know if crossing to US and back could help?? If someone know some information would be great!.