You have two options:
1) Obtain a TRV (tourist visa) and travel to Canada. Claim refugee status when you arrive in Canada.
2) Obtain official refugee status in the country where you are living now or in another country (not Yemen). Typically this refugee status is given by organizations such as UNHCR. UNHCR will then determine where you and your family are resettled (it may be Canada or it may be another country).