Most do not choose to cash out FDs until maturity dates so although technically you can convert FD to cash the funds aren’t sitting in a savings account ready to use at a minutes notice. Canada is looking for international travel to countries without a liberal visa process so travel to counties like Thailand won’t help with proof of international travel. Travel to Australia would help but if over 5 years ago and especially over 10 years ago that would not help much. The fact that your father has dementia would also be a complicating factor. Would either try for a supervisa if you qualify given the amount of TRV refusals or have them reapply with some liquid cash available. There isn’t an@canucl78 exact amount and it would also depend on the length of stay they are requesting (would suggest the back for a short visit for their initial visit) but I would have at least 10k in cash. Are your grandparents their parents? If so they have significant amount of family in Canada and an adult child in India which doesn’t create significant ties. Is your sister married? If so does she live with her in-laws? IRCC is aware of the cultural norm that parents typically live with the eldest son so if you are the eldest son that would add to concern that they may attempt to remain in Canada and live with you instead of returning home. Would highlight the need to return to collect pension again but also highlight any other reason that they may need to return home. For example if your sister is getting married, having a child, etc. those may be reasons to show that they have a reason to return to India. If their parents are alive that would be a reason to return to India. If they have other commitments like being part of a charitable organization, being part of a committee, etc. all these things could be mentioned.
