Durability, no problem. The usual problems of the earlier gen Swift seems to have been resolved already, and don't seem to be an issue with the 1.2.
Aftersales is fine as well, just get some feedback here on which casas give the best service (and the best discounts!)

Of course, unlike Hondas and Toyotas, surplus parts are pretty hard to come by--but if you're sticking to your 3-year warranty, you're required to buy OEM anyway.
However much I love my Swift though, I can't deny that the backseat is pretty tight. Smaller boot than other hatchbacks too. Best bet would be to check it out at the showroom with your family to see how you all fit
