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Thanks everyone who has replied. I am re applying again with 6 months of visa duration ,though I still am not able to understand how my other colleagues dependents visitor visa got approved even with 2 year duration.

While re-applying I am seeing the below questions. Can someone help with me with what would be a suitable reply for this.?

Have you ever been refused a visa or permit, denied entry to, or ordered to leave any country or territory?

There is nothing called a dependent visitor visa. They may have received a TRV with an expiry date of 2 years but that doesn’t allow them to remain for 2 years. At the POE they could attempt to ask to have their stay period coincide with your WP. Since 2 years is not visiting the spouse was likely advised to apply for an OWP if they wanted to live in Canada.
 
You answer YES. On any visa or permit applications from now (for any any country) they must answer YES. As advised, your spouse should be applying for a SOWP and children for study permits if over age 5.
Hey.Thanks for the reply.Yes I would answer it as YES.Should we also mention in detail why the previous VISA application got refused?