Hi Loveneet,
I suggest you should do the following when you re-apply.
Your parents must demonstrate strong ties to India.
Your dad should provide an Explanation: My Strong Ties to My Home Country viz India.... this will have separate sections for the below ties.... all amounts mentioned should be in both CAD and INR:
Employment Ties
NOC + Appointment Letter + Letter stating his current designation and emoluments + 6 months salary slips + is he eligible for any promotion/salary revision as per Central Government rules, if yes, then provide supporting documents + ITR for the last 2-3 years
Property Ties
Sale Deed for each property + Property Evaluation done by the CA along with current market evaluation proofs like from MagicBricks or Property Times for the area where your dad's property is located + latest Property Tax receipts + if it is not mortgaged/no loans or low mortgage balance then state this
If it is an apartment in a housing society then also provide latest maintenance receipts + copy of share certificates + if rented, then provide evidence for rental income
Financial Ties
Proofs of financial investments in FDs, RDs, mutual funds, last 6 months of bank statements, shares/stocks with current market value and dividend stubs, bonds, PF, EPF, LIC, foreign currency if purchased from a RBI licensed Forex dealer, gold jewelry evaluation (self), etc
If your dad has invested in FDs then do mention that the FDs are not locked-in or mortgaged and can be liquidated if required
Family Ties
Immediate family: Mention about your elder brother + any other siblings + grandparents (if they live in the same house).... also mention your elder brother is studying and is dependent on your parents.... mention any other dependent siblings/relatives also
Extended family: Broadly mention your maternal/paternal relatives (names/addresses are not required) who live in the same city or in India
Any other ties that you parents have to India.... for eg: if they volunteer in a charity organization or maybe Rotary/Lions Club, etc
You must provide separate evidence for your mom if she is employed.... if she is a homemaker then you can say that your dad will take care of her airfare/travel and living expenses during the visit.
Your parents must show about CAD 1000/week per person for the visit.
For how many weeks do your parents wish to visit?
Your parents must also draw up a detailed day-by-day (broadly) itinerary that includes sightseeing, meeting friends, etc.... and not just say that they are visiting for your convocation.... in this detailed itinerary, your parents must include expense estimates for the sightseeing and prove that they have liquid finances to support this itinerary
Do your parents have to return to India by a specific date? Then mention this in the Cover Letter and back it up with evidence
Also, please submit paper applications
Hope this helps your parents to get their TRVs