If your father is
sponsoring you to Canada, you will be under the age of 22, not married (or in a married-like relationship), and his dependant.
Your nationality is not known to us. Care to share the circumstances further, please? (ie., if your Dad is a citizen other than Canadian, married here, and you're his dependant.) That would be different than if he was Canadian, had you with your mother in Venuzuela, and is now getting your citizenship papers to you. It may also be that your Dad got work here, is coming under the skilled worker program and is sponsoring you.
If you enter into anything other than a bf/gf relationship with this man at this time, you could jeopardize your own sponsorship under the request of your father.
It would be better to keep it bf/gf, not living together, have you land and then explore your options to sponsor him. Permanent Residents are unable to be out of the country to sponsor their partners. It may even mean you marry, however getting
you into Canada is the best bet and main concen for now.
I mean no disrespect from the other poster, but would caution you to explore this situation more thoroughly than just here on a forum.
Forums are amazing for opinions, guesses, emotional support and estimates, but for facts, it's always best to start at the source:
http://www.cic.gc.ca/english/immigrate/index.asp