What is the polite way to say a grandparent has passed away? I've been trying to find out what is the polite way of telling someone that someone, specifically a relative, has passed away? I'm pretty sure it's not very nice to say someone died （死）。 Google translate suggests 他去世了。But is that right? Is it different for Cantonese?
The common polite terms for 「死了」(died):


過身 (passed away)
去世 (left this world)
逝世 (departed from this world)
仙逝 (departed to the spiritual world)
走了 (had gone)


Example sentences:


他過身了
他已經去世了
曹操在 220 AD 逝世
我祖父早已仙逝
我父母都走了


走咗(走了) is the most popular one among Cantonese speakers  because of the vagueness ( as if the dead person was just gone for a trip) 


  What is the polite way to say a grandparent has passed away?


"祖父過身了" 


  could you provide the jyutping?


90% of the time Cantonese would use the two below:

我祖父過咗身 ngo5 zou2 fu6 gwo3 zo2 san1

我祖父走咗嘞 ngo5 zou2 fu6 zau2 zo2 lak6